21692470 has 16 divisors (see below), whose sum is σ = 39275280. Its totient is φ = 8626144.

The previous prime is 21692453. The next prime is 21692501. The reversal of 21692470 is 7429612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4540 + ... + 7999.

It is an arithmetic number, because the mean of its divisors is an integer number (2454705).

Almost surely, 2^21692470 is an apocalyptic number.

21692470 is a deficient number, since it is larger than the sum of its proper divisors (17582810).

21692470 is a wasteful number, since it uses less digits than its factorization.

21692470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12719.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 21692470 is about 4657.5175791402. The cubic root of 21692470 is about 278.8921788037.

The spelling of 21692470 in words is "twenty-one million, six hundred ninety-two thousand, four hundred seventy".