20331440012981 has 2 divisors, whose sum is σ = 20331440012982. Its totient is φ = 20331440012980.

The previous prime is 20331440012977. The next prime is 20331440013023. The reversal of 20331440012981 is 18921004413302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11082141130225 + 9249298882756 = 3328985^2 + 3041266^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331440012981 - 2² = 20331440012977 is a prime.

It is a super-2 number, since 2×20331440012981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331440012881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165720006490 + 10165720006491.

It is an arithmetic number, because the mean of its divisors is an integer number (10165720006491).

Almost surely, 2^{20331440012981} is an apocalyptic number.

It is an amenable number.

20331440012981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331440012981 is an equidigital number, since it uses as much as digits as its factorization.

20331440012981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 20331440012981 in words is "twenty trillion, three hundred thirty-one billion, four hundred forty million, twelve thousand, nine hundred eighty-one".