21332131020 has 72 divisors (see below), whose sum is σ = 64722962304. Its totient is φ = 5687205888.

The previous prime is 21332130959. The next prime is 21332131031. The reversal of 21332131020 is 2013123312.

21332131020 is a `hidden beast` number, since 2 + 1 + 332 + 1 + 310 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21332130984 and 21332131002.

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, 904012 + ... + 927308.

It is an arithmetic number, because the mean of its divisors is an integer number (898930032).

Almost surely, 2^21332131020 is an apocalyptic number.

21332131020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21332131020 is an abundant number, since it is smaller than the sum of its proper divisors (43390831284).

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

21332131020 is a wasteful number, since it uses less digits than its factorization.

21332131020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28399 (or 28394 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21332131020 its reverse (2013123312), we get a palindrome (23345254332).

The spelling of 21332131020 in words is "twenty-one billion, three hundred thirty-two million, one hundred thirty-one thousand, twenty".