210213020311981 has 2 divisors, whose sum is σ = 210213020311982. Its totient is φ = 210213020311980.

The previous prime is 210213020311967. The next prime is 210213020312021. The reversal of 210213020311981 is 189113020312012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205447788902500 + 4765231409481 = 14333450^2 + 2182941^2 .

It is a cyclic number.

It is not a de Polignac number, because 210213020311981 - 2³⁷ = 210075581358509 is a prime.

It is a super-2 number, since 2×210213020311981² (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 (210213020311951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105106510155990 + 105106510155991.

It is an arithmetic number, because the mean of its divisors is an integer number (105106510155991).

Almost surely, 2^{210213020311981} is an apocalyptic number.

It is an amenable number.

210213020311981 is a deficient number, since it is larger than the sum of its proper divisors (1).

210213020311981 is an equidigital number, since it uses as much as digits as its factorization.

210213020311981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

Adding to 210213020311981 its reverse (189113020312012), we get a palindrome (399326040623993).

The spelling of 210213020311981 in words is "two hundred ten trillion, two hundred thirteen billion, twenty million, three hundred eleven thousand, nine hundred eighty-one".