15422472056021 has 2 divisors, whose sum is σ = 15422472056022. Its totient is φ = 15422472056020.

The previous prime is 15422472055981. The next prime is 15422472056041. The reversal of 15422472056021 is 12065027422451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14963079549796 + 459392506225 = 3868214^2 + 677785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15422472056021 is a prime.

It is a super-2 number, since 2×15422472056021² (a number of 27 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 15422472056021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15422472056041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7711236028010 + 7711236028011.

It is an arithmetic number, because the mean of its divisors is an integer number (7711236028011).

Almost surely, 2^{15422472056021} is an apocalyptic number.

It is an amenable number.

15422472056021 is a deficient number, since it is larger than the sum of its proper divisors (1).

15422472056021 is an equidigital number, since it uses as much as digits as its factorization.

15422472056021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 268800, while the sum is 41.

Adding to 15422472056021 its reverse (12065027422451), we get a palindrome (27487499478472).

The spelling of 15422472056021 in words is "fifteen trillion, four hundred twenty-two billion, four hundred seventy-two million, fifty-six thousand, twenty-one".