21692427 has 16 divisors (see below), whose sum is σ = 30827520. Its totient is φ = 13536512.

The previous prime is 21692387. The next prime is 21692453. The reversal of 21692427 is 72429612.

It is not a de Polignac number, because 21692427 - 2⁸ = 21692171 is a prime.

It is a super-2 number, since 2×21692427² = 941122778300658, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21696427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102 + ... + 6587.

It is an arithmetic number, because the mean of its divisors is an integer number (1926720).

Almost surely, 2^21692427 is an apocalyptic number.

21692427 is a deficient number, since it is larger than the sum of its proper divisors (9135093).

21692427 is a wasteful number, since it uses less digits than its factorization.

21692427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6762.

The product of its digits is 12096, while the sum is 33.

The square root of 21692427 is about 4657.5129629449. The cubic root of 21692427 is about 278.8919945252.

The spelling of 21692427 in words is "twenty-one million, six hundred ninety-two thousand, four hundred twenty-seven".