21533621332 has 12 divisors (see below), whose sum is σ = 38485621440. Its totient is φ = 10537729496.

The previous prime is 21533621327. The next prime is 21533621341. The reversal of 21533621332 is 23312633512.

It is a junction number, because it is equal to n+sod(n) for n = 21533621294 and 21533621303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57270082 + ... + 57270457.

It is an arithmetic number, because the mean of its divisors is an integer number (3207135120).

Almost surely, 2^21533621332 is an apocalyptic number.

It is an amenable number.

21533621332 is a deficient number, since it is larger than the sum of its proper divisors (16952000108).

21533621332 is a wasteful number, since it uses less digits than its factorization.

21533621332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114540590 (or 114540588 counting only the distinct ones).

The product of its digits is 19440, while the sum is 31.

The spelling of 21533621332 in words is "twenty-one billion, five hundred thirty-three million, six hundred twenty-one thousand, three hundred thirty-two".