21284792 has 16 divisors (see below), whose sum is σ = 40198200. Its totient is φ = 10565280.

The previous prime is 21284789. The next prime is 21284797. The reversal of 21284792 is 29748212.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21284797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8459 + ... + 10682.

Almost surely, 2^21284792 is an apocalyptic number.

It is an amenable number.

21284792 is a deficient number, since it is larger than the sum of its proper divisors (18913408).

21284792 is a wasteful number, since it uses less digits than its factorization.

21284792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19286 (or 19282 counting only the distinct ones).

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

The square root of 21284792 is about 4613.5444075028. The cubic root of 21284792 is about 277.1339957387.

The spelling of 21284792 in words is "twenty-one million, two hundred eighty-four thousand, seven hundred ninety-two".