5025221011981 has 2 divisors, whose sum is σ = 5025221011982. Its totient is φ = 5025221011980.

The previous prime is 5025221011963. The next prime is 5025221012023. The reversal of 5025221011981 is 1891101225205.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3065615792100 + 1959605219881 = 1750890^2 + 1399859^2 .

It is a cyclic number.

It is not a de Polignac number, because 5025221011981 - 2¹¹ = 5025221009933 is a prime.

It is a super-2 number, since 2×5025221011981² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 5025221011981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5025221081981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2512610505990 + 2512610505991.

It is an arithmetic number, because the mean of its divisors is an integer number (2512610505991).

Almost surely, 2^{5025221011981} is an apocalyptic number.

It is an amenable number.

5025221011981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5025221011981 is an equidigital number, since it uses as much as digits as its factorization.

5025221011981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 37.

The spelling of 5025221011981 in words is "five trillion, twenty-five billion, two hundred twenty-one million, eleven thousand, nine hundred eighty-one".