21232652 has 48 divisors (see below), whose sum is σ = 45239040. Its totient is φ = 8517312.

The previous prime is 21232639. The next prime is 21232663. The reversal of 21232652 is 25623212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56738 + ... + 57110.

It is an arithmetic number, because the mean of its divisors is an integer number (942480).

Almost surely, 2^21232652 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 21232652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22619520).

21232652 is an abundant number, since it is smaller than the sum of its proper divisors (24006388).

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

21232652 is a wasteful number, since it uses less digits than its factorization.

21232652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510 (or 508 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 21232652 is about 4607.8901896638. The cubic root of 21232652 is about 276.9075182063.

Adding to 21232652 its reverse (25623212), we get a palindrome (46855864).

The spelling of 21232652 in words is "twenty-one million, two hundred thirty-two thousand, six hundred fifty-two".