21438762 has 32 divisors (see below), whose sum is σ = 44323200. Its totient is φ = 6907968.

The previous prime is 21438757. The next prime is 21438779. The reversal of 21438762 is 26783412.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59539 + ... + 59897.

It is an arithmetic number, because the mean of its divisors is an integer number (1385100).

Almost surely, 2^21438762 is an apocalyptic number.

21438762 is an abundant number, since it is smaller than the sum of its proper divisors (22884438).

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

21438762 is a wasteful number, since it uses less digits than its factorization.

21438762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670.

The product of its digits is 16128, while the sum is 33.

The square root of 21438762 is about 4630.2010755474. The cubic root of 21438762 is about 277.8006351443.

The spelling of 21438762 in words is "twenty-one million, four hundred thirty-eight thousand, seven hundred sixty-two".