21413960 has 16 divisors (see below), whose sum is σ = 48181500. Its totient is φ = 8565568.

The previous prime is 21413947. The next prime is 21413971. The reversal of 21413960 is 6931412.

It can be written as a sum of positive squares in 2 ways, for example, as 21362884 + 51076 = 4622^2 + 226^2 .

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, 267635 + ... + 267714.

Almost surely, 2^21413960 is an apocalyptic number.

21413960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21413960 is an abundant number, since it is smaller than the sum of its proper divisors (26767540).

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

21413960 is a wasteful number, since it uses less digits than its factorization.

21413960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535360 (or 535356 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21413960 is about 4627.5220150746. The cubic root of 21413960 is about 277.6934667977.

The spelling of 21413960 in words is "twenty-one million, four hundred thirteen thousand, nine hundred sixty".