21679160 has 32 divisors (see below), whose sum is σ = 49971600. Its totient is φ = 8459520.

The previous prime is 21679159. The next prime is 21679169. The reversal of 21679160 is 6197612.

It is a happy number.

It is a Smith number, since the sum of its digits (32) 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 (21679169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4970 + ... + 8249.

Almost surely, 2^21679160 is an apocalyptic number.

21679160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21679160 is an abundant number, since it is smaller than the sum of its proper divisors (28292440).

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

21679160 is a wasteful number, since it uses less digits than its factorization.

21679160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13271 (or 13267 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 21679160 is about 4656.0884871317. The cubic root of 21679160 is about 278.8351265275.

The spelling of 21679160 in words is "twenty-one million, six hundred seventy-nine thousand, one hundred sixty".