21610472 has 32 divisors (see below), whose sum is σ = 45050880. Its totient is φ = 9650880.

The previous prime is 21610453. The next prime is 21610487. The reversal of 21610472 is 27401612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128 + ... + 6575.

It is an arithmetic number, because the mean of its divisors is an integer number (1407840).

Almost surely, 2^21610472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21610472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22525440).

21610472 is an abundant number, since it is smaller than the sum of its proper divisors (23440408).

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

21610472 is a wasteful number, since it uses less digits than its factorization.

21610472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6753 (or 6749 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21610472 is about 4648.7064867552. The cubic root of 21610472 is about 278.5403289661.

The spelling of 21610472 in words is "twenty-one million, six hundred ten thousand, four hundred seventy-two".