21359952 has 120 divisors (see below), whose sum is σ = 64931360. Its totient is φ = 6531840.

The previous prime is 21359903. The next prime is 21359953. The reversal of 21359952 is 25995312.

It is a happy number.

21359952 is a `hidden beast` number, since 2 + 13 + 599 + 52 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21359953) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101127 + ... + 101337.

Almost surely, 2^21359952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21359952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32465680).

21359952 is an abundant number, since it is smaller than the sum of its proper divisors (43571408).

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

21359952 is a wasteful number, since it uses less digits than its factorization.

21359952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 272 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 21359952 is about 4621.6828104058. The cubic root of 21359952 is about 277.4598140006.

The spelling of 21359952 in words is "twenty-one million, three hundred fifty-nine thousand, nine hundred fifty-two".