21472605 has 48 divisors (see below), whose sum is σ = 46410624. Its totient is φ = 8922240.

The previous prime is 21472597. The next prime is 21472621. The reversal of 21472605 is 50627412.

It is not a de Polignac number, because 21472605 - 2³ = 21472597 is a prime.

It is a super-2 number, since 2×21472605² = 922145530972050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 367 + ... + 6563.

It is an arithmetic number, because the mean of its divisors is an integer number (966888).

Almost surely, 2^21472605 is an apocalyptic number.

It is an amenable number.

21472605 is an abundant number, since it is smaller than the sum of its proper divisors (24938019).

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

21472605 is a wasteful number, since it uses less digits than its factorization.

21472605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6226 (or 6223 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 21472605 is about 4633.8542273145. The cubic root of 21472605 is about 277.9467359956.

The spelling of 21472605 in words is "twenty-one million, four hundred seventy-two thousand, six hundred five".