21221352632515 has 48 divisors (see below), whose sum is σ = 29762036567712. Its totient is φ = 14483657212416.

The previous prime is 21221352632489. The next prime is 21221352632537. The reversal of 21221352632515 is 51523625312212.

It is not a de Polignac number, because 21221352632515 - 2²³ = 21221344243907 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 207559687 + ... + 207661903.

It is an arithmetic number, because the mean of its divisors is an integer number (620042428494).

Almost surely, 2^{21221352632515} is an apocalyptic number.

21221352632515 is a deficient number, since it is larger than the sum of its proper divisors (8540683935197).

21221352632515 is a wasteful number, since it uses less digits than its factorization.

21221352632515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106196 (or 106189 counting only the distinct ones).

The product of its digits is 216000, while the sum is 40.

Adding to 21221352632515 its reverse (51523625312212), we get a palindrome (72744977944727).

The spelling of 21221352632515 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred fifty-two million, six hundred thirty-two thousand, five hundred fifteen".