21376642 has 24 divisors (see below), whose sum is σ = 37469520. Its totient is φ = 9119880.

The previous prime is 21376627. The next prime is 21376651. The reversal of 21376642 is 24667312.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32109 + ... + 32767.

It is an arithmetic number, because the mean of its divisors is an integer number (1561230).

Almost surely, 2^21376642 is an apocalyptic number.

21376642 is a deficient number, since it is larger than the sum of its proper divisors (16092878).

21376642 is a wasteful number, since it uses less digits than its factorization.

21376642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006 (or 999 counting only the distinct ones).

The product of its digits is 12096, while the sum is 31.

The square root of 21376642 is about 4623.4880771989. The cubic root of 21376642 is about 277.5320613336.

The spelling of 21376642 in words is "twenty-one million, three hundred seventy-six thousand, six hundred forty-two".