21231505332 has 36 divisors (see below), whose sum is σ = 54810415296. Its totient is φ = 6926589840.

The previous prime is 21231505319. The next prime is 21231505349. The reversal of 21231505332 is 23350513212.

It is a happy number.

21231505332 is a `hidden beast` number, since 2 + 12 + 315 + 0 + 5 + 332 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 21231505296 and 21231505305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6272394 + ... + 6275777.

It is an arithmetic number, because the mean of its divisors is an integer number (1522511536).

Almost surely, 2^21231505332 is an apocalyptic number.

It is an amenable number.

21231505332 is an abundant number, since it is smaller than the sum of its proper divisors (33578909964).

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

21231505332 is a wasteful number, since it uses less digits than its factorization.

21231505332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12548228 (or 12548223 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The spelling of 21231505332 in words is "twenty-one billion, two hundred thirty-one million, five hundred five thousand, three hundred thirty-two".