21151564332 has 48 divisors (see below), whose sum is σ = 52212384000. Its totient is φ = 6645862080.

The previous prime is 21151564331. The next prime is 21151564349. The reversal of 21151564332 is 23346515112.

It is a junction number, because it is equal to n+sod(n) for n = 21151564293 and 21151564302.

It is not an unprimeable number, because it can be changed into a prime (21151564331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187719 + ... + 278462.

It is an arithmetic number, because the mean of its divisors is an integer number (1087758000).

Almost surely, 2^21151564332 is an apocalyptic number.

It is an amenable number.

21151564332 is an abundant number, since it is smaller than the sum of its proper divisors (31060819668).

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

21151564332 is a wasteful number, since it uses less digits than its factorization.

21151564332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466406 (or 466404 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The spelling of 21151564332 in words is "twenty-one billion, one hundred fifty-one million, five hundred sixty-four thousand, three hundred thirty-two".