210515345039981 has 2 divisors, whose sum is σ = 210515345039982. Its totient is φ = 210515345039980.

The previous prime is 210515345039953. The next prime is 210515345040041. The reversal of 210515345039981 is 189930543515012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152984121255625 + 57531223784356 = 12368675^2 + 7584934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210515345039981 is a prime.

It is a super-2 number, since 2×210515345039981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210515345032981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105257672519990 + 105257672519991.

It is an arithmetic number, because the mean of its divisors is an integer number (105257672519991).

Almost surely, 2^{210515345039981} is an apocalyptic number.

It is an amenable number.

210515345039981 is a deficient number, since it is larger than the sum of its proper divisors (1).

210515345039981 is an equidigital number, since it uses as much as digits as its factorization.

210515345039981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832000, while the sum is 56.

The spelling of 210515345039981 in words is "two hundred ten trillion, five hundred fifteen billion, three hundred forty-five million, thirty-nine thousand, nine hundred eighty-one".