21742892 has 6 divisors (see below), whose sum is σ = 38050068. Its totient is φ = 10871444.

The previous prime is 21742829. The next prime is 21742913. The reversal of 21742892 is 29824712.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2717858 + ... + 2717865.

It is an arithmetic number, because the mean of its divisors is an integer number (6341678).

Almost surely, 2^21742892 is an apocalyptic number.

It is an amenable number.

21742892 is a deficient number, since it is larger than the sum of its proper divisors (16307176).

21742892 is a wasteful number, since it uses less digits than its factorization.

21742892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5435727 (or 5435725 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 21742892 is about 4662.9274066835. The cubic root of 21742892 is about 279.1080973538.

The spelling of 21742892 in words is "twenty-one million, seven hundred forty-two thousand, eight hundred ninety-two".