21620679 has 8 divisors (see below), whose sum is σ = 28854912. Its totient is φ = 14400120.

The previous prime is 21620659. The next prime is 21620693. The reversal of 21620679 is 97602612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21620679 - 2¹² = 21616583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1144 + ... + 6674.

It is an arithmetic number, because the mean of its divisors is an integer number (3606864).

Almost surely, 2^21620679 is an apocalyptic number.

21620679 is a deficient number, since it is larger than the sum of its proper divisors (7234233).

21620679 is a wasteful number, since it uses less digits than its factorization.

21620679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6837.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 21620679 is about 4649.8041894256. The cubic root of 21620679 is about 278.5841752033.

The spelling of 21620679 in words is "twenty-one million, six hundred twenty thousand, six hundred seventy-nine".