21348732 has 24 divisors (see below), whose sum is σ = 50176000. Its totient is φ = 7064496.

The previous prime is 21348731. The next prime is 21348749. The reversal of 21348732 is 23784312.

It is a self number, because there is not a number n which added to its sum of digits gives 21348732.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4732 + ... + 8067.

Almost surely, 2^21348732 is an apocalyptic number.

It is an amenable number.

21348732 is an abundant number, since it is smaller than the sum of its proper divisors (28827268).

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

21348732 is a wasteful number, since it uses less digits than its factorization.

21348732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12945 (or 12943 counting only the distinct ones).

The product of its digits is 8064, while the sum is 30.

The square root of 21348732 is about 4620.4688073831. The cubic root of 21348732 is about 277.4112239358.

The spelling of 21348732 in words is "twenty-one million, three hundred forty-eight thousand, seven hundred thirty-two".