356200921981 has 2 divisors, whose sum is σ = 356200921982. Its totient is φ = 356200921980.

The previous prime is 356200921969. The next prime is 356200922009. The reversal of 356200921981 is 189129002653.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 325166814756 + 31034107225 = 570234^2 + 176165^2 .

It is a cyclic number.

It is not a de Polignac number, because 356200921981 - 2¹¹ = 356200919933 is a prime.

It is a super-2 number, since 2×356200921981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (356200901981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 178100460990 + 178100460991.

It is an arithmetic number, because the mean of its divisors is an integer number (178100460991).

Almost surely, 2^356200921981 is an apocalyptic number.

It is an amenable number.

356200921981 is a deficient number, since it is larger than the sum of its proper divisors (1).

356200921981 is an equidigital number, since it uses as much as digits as its factorization.

356200921981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 356200921981 in words is "three hundred fifty-six billion, two hundred million, nine hundred twenty-one thousand, nine hundred eighty-one".