21377692 has 24 divisors (see below), whose sum is σ = 42932736. Its totient is φ = 9123888.

The previous prime is 21377677. The next prime is 21377701. The reversal of 21377692 is 29677312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5913 + ... + 8815.

It is an arithmetic number, because the mean of its divisors is an integer number (1788864).

Almost surely, 2^21377692 is an apocalyptic number.

It is an amenable number.

21377692 is an abundant number, since it is smaller than the sum of its proper divisors (21555044).

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

21377692 is a wasteful number, since it uses less digits than its factorization.

21377692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3177 (or 3175 counting only the distinct ones).

The product of its digits is 31752, while the sum is 37.

The square root of 21377692 is about 4623.6016264380. The cubic root of 21377692 is about 277.5366052948.

The spelling of 21377692 in words is "twenty-one million, three hundred seventy-seven thousand, six hundred ninety-two".