21122415265 has 16 divisors (see below), whose sum is σ = 28970616960. Its totient is φ = 14482575360.

The previous prime is 21122415227. The next prime is 21122415317. The reversal of 21122415265 is 56251422112.

It is not a de Polignac number, because 21122415265 - 2¹³ = 21122407073 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 471406 + ... + 514264.

It is an arithmetic number, because the mean of its divisors is an integer number (1810663560).

Almost surely, 2^21122415265 is an apocalyptic number.

It is an amenable number.

21122415265 is a deficient number, since it is larger than the sum of its proper divisors (7848201695).

21122415265 is a wasteful number, since it uses less digits than its factorization.

21122415265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56952.

The product of its digits is 9600, while the sum is 31.

Adding to 21122415265 its reverse (56251422112), we get a palindrome (77373837377).

The spelling of 21122415265 in words is "twenty-one billion, one hundred twenty-two million, four hundred fifteen thousand, two hundred sixty-five".