202018383821 has 2 divisors, whose sum is σ = 202018383822. Its totient is φ = 202018383820.

The previous prime is 202018383811. The next prime is 202018383863. The reversal of 202018383821 is 128383810202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167649302500 + 34369081321 = 409450^2 + 185389^2 .

It is a cyclic number.

It is not a de Polignac number, because 202018383821 - 2¹⁸ = 202018121677 is a prime.

It is a super-2 number, since 2×202018383821² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202018383811) 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, 101009191910 + 101009191911.

It is an arithmetic number, because the mean of its divisors is an integer number (101009191911).

Almost surely, 2^202018383821 is an apocalyptic number.

It is an amenable number.

202018383821 is a deficient number, since it is larger than the sum of its proper divisors (1).

202018383821 is an equidigital number, since it uses as much as digits as its factorization.

202018383821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 38.

The spelling of 202018383821 in words is "two hundred two billion, eighteen million, three hundred eighty-three thousand, eight hundred twenty-one".