21153352 has 16 divisors (see below), whose sum is σ = 43268400. Its totient is φ = 9615120.

The previous prime is 21153347. The next prime is 21153359. The reversal of 21153352 is 25335112.

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

It is not an unprimeable number, because it can be changed into a prime (21153359) 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, 120102 + ... + 120277.

It is an arithmetic number, because the mean of its divisors is an integer number (2704275).

Almost surely, 2^21153352 is an apocalyptic number.

21153352 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21153352 is an abundant number, since it is smaller than the sum of its proper divisors (22115048).

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

21153352 is a wasteful number, since it uses less digits than its factorization.

21153352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240396 (or 240392 counting only the distinct ones).

The product of its digits is 900, while the sum is 22.

The square root of 21153352 is about 4599.2773345385. The cubic root of 21153352 is about 276.5623554767.

Adding to 21153352 its reverse (25335112), we get a palindrome (46488464).

The spelling of 21153352 in words is "twenty-one million, one hundred fifty-three thousand, three hundred fifty-two".