21015534332 has 72 divisors (see below), whose sum is σ = 41544253296. Its totient is φ = 9246150144.

The previous prime is 21015534251. The next prime is 21015534343. The reversal of 21015534332 is 23343551012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21015534295 and 21015534304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9269063 + ... + 9271329.

It is an arithmetic number, because the mean of its divisors is an integer number (577003518).

Almost surely, 2^21015534332 is an apocalyptic number.

It is an amenable number.

21015534332 is a deficient number, since it is larger than the sum of its proper divisors (20528718964).

21015534332 is a wasteful number, since it uses less digits than its factorization.

21015534332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667 (or 2642 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

The spelling of 21015534332 in words is "twenty-one billion, fifteen million, five hundred thirty-four thousand, three hundred thirty-two".