21384632 has 16 divisors (see below), whose sum is σ = 40662000. Its totient is φ = 10541440.

The previous prime is 21384619. The next prime is 21384647. The reversal of 21384632 is 23648312.

It is a junction number, because it is equal to n+sod(n) for n = 21384595 and 21384604.

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, 18257 + ... + 19392.

It is an arithmetic number, because the mean of its divisors is an integer number (2541375).

Almost surely, 2^21384632 is an apocalyptic number.

It is an amenable number.

21384632 is a deficient number, since it is larger than the sum of its proper divisors (19277368).

21384632 is a wasteful number, since it uses less digits than its factorization.

21384632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37726 (or 37722 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 21384632 is about 4624.3520627219. The cubic root of 21384632 is about 277.5666349732.

The spelling of 21384632 in words is "twenty-one million, three hundred eighty-four thousand, six hundred thirty-two".