21526472 has 16 divisors (see below), whose sum is σ = 44031600. Its totient is φ = 9784720.

The previous prime is 21526469. The next prime is 21526499. The reversal of 21526472 is 27462512.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122222 + ... + 122397.

It is an arithmetic number, because the mean of its divisors is an integer number (2751975).

Almost surely, 2^21526472 is an apocalyptic number.

21526472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21526472 is an abundant number, since it is smaller than the sum of its proper divisors (22505128).

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

21526472 is a wasteful number, since it uses less digits than its factorization.

21526472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244636 (or 244632 counting only the distinct ones).

The product of its digits is 6720, while the sum is 29.

The square root of 21526472 is about 4639.6629187905. The cubic root of 21526472 is about 278.1789645233.

Adding to 21526472 its reverse (27462512), we get a palindrome (48988984).

The spelling of 21526472 in words is "twenty-one million, five hundred twenty-six thousand, four hundred seventy-two".