21113952 has 24 divisors (see below), whose sum is σ = 55424376. Its totient is φ = 7037952.

The previous prime is 21113941. The next prime is 21113957. The reversal of 21113952 is 25931112.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113957) 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, 109873 + ... + 110064.

It is an arithmetic number, because the mean of its divisors is an integer number (2309349).

Almost surely, 2^21113952 is an apocalyptic number.

It is an amenable number.

21113952 is an abundant number, since it is smaller than the sum of its proper divisors (34310424).

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

21113952 is a wasteful number, since it uses less digits than its factorization.

21113952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219950 (or 219942 counting only the distinct ones).

The product of its digits is 540, while the sum is 24.

The square root of 21113952 is about 4594.9920565764. The cubic root of 21113952 is about 276.3905414291.

The spelling of 21113952 in words is "twenty-one million, one hundred thirteen thousand, nine hundred fifty-two".