21122532615 has 32 divisors (see below), whose sum is σ = 34020616896. Its totient is φ = 11190748160.

The previous prime is 21122532601. The next prime is 21122532619. The reversal of 21122532615 is 51623522112.

It is not a de Polignac number, because 21122532615 - 2⁶ = 21122532551 is a prime.

It is a super-2 number, since 2×21122532615² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122532619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1385635 + ... + 1400795.

It is an arithmetic number, because the mean of its divisors is an integer number (1063144278).

Almost surely, 2^21122532615 is an apocalyptic number.

21122532615 is a deficient number, since it is larger than the sum of its proper divisors (12898084281).

21122532615 is a wasteful number, since it uses less digits than its factorization.

21122532615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15779.

The product of its digits is 7200, while the sum is 30.

The spelling of 21122532615 in words is "twenty-one billion, one hundred twenty-two million, five hundred thirty-two thousand, six hundred fifteen".