21522111314425 has 24 divisors (see below), whose sum is σ = 26882958639456. Its totient is φ = 17091540762240.

The previous prime is 21522111314413. The next prime is 21522111314441. The reversal of 21522111314425 is 52441311122512.

It is a de Polignac number, because none of the positive numbers 2^k-21522111314425 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 176542342 + ... + 176664208.

It is an arithmetic number, because the mean of its divisors is an integer number (1120123276644).

Almost surely, 2^{21522111314425} is an apocalyptic number.

21522111314425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21522111314425 is a deficient number, since it is larger than the sum of its proper divisors (5360847325031).

21522111314425 is a wasteful number, since it uses less digits than its factorization.

21522111314425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173577 (or 173572 counting only the distinct ones).

The product of its digits is 19200, while the sum is 34.

Adding to 21522111314425 its reverse (52441311122512), we get a palindrome (73963422436937).

The spelling of 21522111314425 in words is "twenty-one trillion, five hundred twenty-two billion, one hundred eleven million, three hundred fourteen thousand, four hundred twenty-five".