21689192 has 16 divisors (see below), whose sum is σ = 46476960. Its totient is φ = 9295344.

The previous prime is 21689179. The next prime is 21689197. The reversal of 21689192 is 29198612.

It is a super-2 number, since 2×21689192² = 940842099225728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21689197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193598 + ... + 193709.

It is an arithmetic number, because the mean of its divisors is an integer number (2904810).

Almost surely, 2^21689192 is an apocalyptic number.

It is an amenable number.

21689192 is an abundant number, since it is smaller than the sum of its proper divisors (24787768).

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

21689192 is a wasteful number, since it uses less digits than its factorization.

21689192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387320 (or 387316 counting only the distinct ones).

The product of its digits is 15552, while the sum is 38.

The square root of 21689192 is about 4657.1656616444. The cubic root of 21689192 is about 278.8781300791.

The spelling of 21689192 in words is "twenty-one million, six hundred eighty-nine thousand, one hundred ninety-two".