21152952 has 24 divisors (see below), whose sum is σ = 57289440. Its totient is φ = 7050960.

The previous prime is 21152951. The next prime is 21152969. The reversal of 21152952 is 25925112.

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

It is a super-4 number, since 4×21152952⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 146824 + ... + 146967.

It is an arithmetic number, because the mean of its divisors is an integer number (2387060).

Almost surely, 2^21152952 is an apocalyptic number.

It is an amenable number.

21152952 is an abundant number, since it is smaller than the sum of its proper divisors (36136488).

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

21152952 is a wasteful number, since it uses less digits than its factorization.

21152952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293803 (or 293796 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 21152952 is about 4599.2338492405. The cubic root of 21152952 is about 276.5606122441.

The spelling of 21152952 in words is "twenty-one million, one hundred fifty-two thousand, nine hundred fifty-two".