21232552 has 32 divisors (see below), whose sum is σ = 43934400. Its totient is φ = 9539200.

The previous prime is 21232531. The next prime is 21232571. The reversal of 21232552 is 25523212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6477 + ... + 9187.

It is an arithmetic number, because the mean of its divisors is an integer number (1372950).

Almost surely, 2^21232552 is an apocalyptic number.

21232552 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21232552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21967200).

21232552 is an abundant number, since it is smaller than the sum of its proper divisors (22701848).

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

21232552 is a wasteful number, since it uses less digits than its factorization.

21232552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817 (or 2813 counting only the distinct ones).

The product of its digits is 1200, while the sum is 22.

The square root of 21232552 is about 4607.8793386980. The cubic root of 21232552 is about 276.9070834860.

Adding to 21232552 its reverse (25523212), we get a palindrome (46755764).

The spelling of 21232552 in words is "twenty-one million, two hundred thirty-two thousand, five hundred fifty-two".