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1211001100021 is a prime number
BaseRepresentation
bin10001100111110101010…
…010100101011011110101
311021202210202012220011101
4101213311102211123311
5124320112240200041
62324154244210101
7153330510336646
oct21476522453365
94252722186141
101211001100021
11427645606399
12176849999931
138a273808c4b
14428816036cd
152177a8e5b31
hex119f54a56f5

1211001100021 has 2 divisors, whose sum is σ = 1211001100022. Its totient is φ = 1211001100020.

The previous prime is 1211001099977. The next prime is 1211001100061. The reversal of 1211001100021 is 1200011001121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1163725295121 + 47275804900 = 1078761^2 + 217430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211001100021 - 213 = 1211001091829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211001099980 and 1211001100007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211001100061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605500550010 + 605500550011.

It is an arithmetic number, because the mean of its divisors is an integer number (605500550011).

Almost surely, 21211001100021 is an apocalyptic number.

It is an amenable number.

1211001100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211001100021 is an equidigital number, since it uses as much as digits as its factorization.

1211001100021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1211001100021 its reverse (1200011001121), we get a palindrome (2411012101142).

The spelling of 1211001100021 in words is "one trillion, two hundred eleven billion, one million, one hundred thousand, twenty-one".