21473694 has 32 divisors (see below), whose sum is σ = 52058880. Its totient is φ = 6507000.

The previous prime is 21473671. The next prime is 21473707. The reversal of 21473694 is 49637412.

It is a super-2 number, since 2×21473694² = 922239068011272, which contains 22 as substring.

It is a congruent number.

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, 17482 + ... + 18669.

It is an arithmetic number, because the mean of its divisors is an integer number (1626840).

Almost surely, 2^21473694 is an apocalyptic number.

21473694 is an abundant number, since it is smaller than the sum of its proper divisors (30585186).

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

21473694 is a wasteful number, since it uses less digits than its factorization.

21473694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36173 (or 36167 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 21473694 is about 4633.9717306000. The cubic root of 21473694 is about 277.9514346784.

The spelling of 21473694 in words is "twenty-one million, four hundred seventy-three thousand, six hundred ninety-four".