21460472 has 48 divisors (see below), whose sum is σ = 45987480. Its totient is φ = 9310400.

The previous prime is 21460469. The next prime is 21460499. The reversal of 21460472 is 27406412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46322 + ... + 46782.

Almost surely, 2^21460472 is an apocalyptic number.

21460472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21460472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22993740).

21460472 is an abundant number, since it is smaller than the sum of its proper divisors (24527008).

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

21460472 is a wasteful number, since it uses less digits than its factorization.

21460472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 21460472 is about 4632.5448729613. The cubic root of 21460472 is about 277.8943752764.

Adding to 21460472 its reverse (27406412), we get a palindrome (48866884).

The spelling of 21460472 in words is "twenty-one million, four hundred sixty thousand, four hundred seventy-two".