21452604 has 12 divisors (see below), whose sum is σ = 50056104. Its totient is φ = 7150864.

The previous prime is 21452603. The next prime is 21452609. The reversal of 21452604 is 40625412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893847 + ... + 893870.

It is an arithmetic number, because the mean of its divisors is an integer number (4171342).

Almost surely, 2^21452604 is an apocalyptic number.

It is an amenable number.

21452604 is an abundant number, since it is smaller than the sum of its proper divisors (28603500).

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

21452604 is a wasteful number, since it uses less digits than its factorization.

21452604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787724 (or 1787722 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 21452604 is about 4631.6955858519. The cubic root of 21452604 is about 277.8604098817.

The spelling of 21452604 in words is "twenty-one million, four hundred fifty-two thousand, six hundred four".