21073632 has 24 divisors (see below), whose sum is σ = 55318536. Its totient is φ = 7024512.

The previous prime is 21073627. The next prime is 21073643. The reversal of 21073632 is 23637012.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 109663 + ... + 109854.

It is an arithmetic number, because the mean of its divisors is an integer number (2304939).

Almost surely, 2^21073632 is an apocalyptic number.

It is an amenable number.

21073632 is an abundant number, since it is smaller than the sum of its proper divisors (34244904).

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

21073632 is a wasteful number, since it uses less digits than its factorization.

21073632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219530 (or 219522 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 21073632 is about 4590.6025748261. The cubic root of 21073632 is about 276.2144940478.

The spelling of 21073632 in words is "twenty-one million, seventy-three thousand, six hundred thirty-two".