21651932 has 6 divisors (see below), whose sum is σ = 37890888. Its totient is φ = 10825964.

The previous prime is 21651907. The next prime is 21651943. The reversal of 21651932 is 23915612.

It is a junction number, because it is equal to n+sod(n) for n = 21651895 and 21651904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2706488 + ... + 2706495.

It is an arithmetic number, because the mean of its divisors is an integer number (6315148).

Almost surely, 2^21651932 is an apocalyptic number.

It is an amenable number.

21651932 is a deficient number, since it is larger than the sum of its proper divisors (16238956).

21651932 is a wasteful number, since it uses less digits than its factorization.

21651932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5412987 (or 5412985 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 21651932 is about 4653.1636549771. The cubic root of 21651932 is about 278.7183430437.

The spelling of 21651932 in words is "twenty-one million, six hundred fifty-one thousand, nine hundred thirty-two".