21162531060520 has 32 divisors (see below), whose sum is σ = 47629500849000. Its totient is φ = 8462558030848.

The previous prime is 21162531060511. The next prime is 21162531060563. The reversal of 21162531060520 is 2506013526112.

21162531060520 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13494029190084 + 7668501870436 = 3673422^2 + 2769206^2 .

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 7 ways as a sum of consecutive naturals, for example, 76560109 + ... + 76836028.

Almost surely, 2^{21162531060520} is an apocalyptic number.

21162531060520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21162531060520 is an abundant number, since it is smaller than the sum of its proper divisors (26466969788480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21162531060520 is a wasteful number, since it uses less digits than its factorization.

21162531060520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153399597 (or 153399593 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 21162531060520 its reverse (2506013526112), we get a palindrome (23668544586632).

The spelling of 21162531060520 in words is "twenty-one trillion, one hundred sixty-two billion, five hundred thirty-one million, sixty thousand, five hundred twenty".