21737132 has 12 divisors (see below), whose sum is σ = 38377416. Its totient is φ = 10772160.

The previous prime is 21737129. The next prime is 21737141. The reversal of 21737132 is 23173712.

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, 23594 + ... + 24497.

It is an arithmetic number, because the mean of its divisors is an integer number (3198118).

Almost surely, 2^21737132 is an apocalyptic number.

It is an amenable number.

21737132 is a deficient number, since it is larger than the sum of its proper divisors (16640284).

21737132 is a wasteful number, since it uses less digits than its factorization.

21737132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48208 (or 48206 counting only the distinct ones).

The product of its digits is 1764, while the sum is 26.

The square root of 21737132 is about 4662.3097280211. The cubic root of 21737132 is about 279.0834486146.

The spelling of 21737132 in words is "twenty-one million, seven hundred thirty-seven thousand, one hundred thirty-two".