21892732 has 6 divisors (see below), whose sum is σ = 38312288. Its totient is φ = 10946364.

The previous prime is 21892723. The next prime is 21892747. The reversal of 21892732 is 23729812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2736588 + ... + 2736595.

Almost surely, 2^21892732 is an apocalyptic number.

It is an amenable number.

21892732 is a deficient number, since it is larger than the sum of its proper divisors (16419556).

21892732 is a wasteful number, since it uses less digits than its factorization.

21892732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5473187 (or 5473185 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 21892732 is about 4678.9669800074. The cubic root of 21892732 is about 279.7477830817.

The spelling of 21892732 in words is "twenty-one million, eight hundred ninety-two thousand, seven hundred thirty-two".