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2021202220181 is a prime number
BaseRepresentation
bin11101011010011001000…
…010100101010010010101
321011020002001120020021012
4131122121002211102111
5231103410232021211
64144305534102005
7266012163255044
oct35323102452225
97136061506235
102021202220181
1170a206a62701
1228788064a905
131187a202cba1
146db806c255b
1537899571d8b
hex1d6990a5495

2021202220181 has 2 divisors, whose sum is σ = 2021202220182. Its totient is φ = 2021202220180.

The previous prime is 2021202220153. The next prime is 2021202220187. The reversal of 2021202220181 is 1810222021202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1770586841956 + 250615378225 = 1330634^2 + 500615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-2021202220181 is a prime.

It is a super-2 number, since 2×20212022201812 (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021202220187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010601110090 + 1010601110091.

It is an arithmetic number, because the mean of its divisors is an integer number (1010601110091).

Almost surely, 22021202220181 is an apocalyptic number.

It is an amenable number.

2021202220181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021202220181 is an equidigital number, since it uses as much as digits as its factorization.

2021202220181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 2021202220181 its reverse (1810222021202), we get a palindrome (3831424241383).

It can be divided in two parts, 2021 and 202220181, that added together give a palindrome (202222202).

The spelling of 2021202220181 in words is "two trillion, twenty-one billion, two hundred two million, two hundred twenty thousand, one hundred eighty-one".