21610479 has 24 divisors (see below), whose sum is σ = 32547760. Its totient is φ = 12735360.

The previous prime is 21610453. The next prime is 21610487. The reversal of 21610479 is 97401612.

It is a happy number.

It is not a de Polignac number, because 21610479 - 2⁸ = 21610223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21610439) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12627 + ... + 14235.

Almost surely, 2^21610479 is an apocalyptic number.

21610479 is a deficient number, since it is larger than the sum of its proper divisors (10937281).

21610479 is a wasteful number, since it uses less digits than its factorization.

21610479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671 (or 1660 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 21610479 is about 4648.7072396528. The cubic root of 21610479 is about 278.5403590408.

The spelling of 21610479 in words is "twenty-one million, six hundred ten thousand, four hundred seventy-nine".