21021352 has 16 divisors (see below), whose sum is σ = 42998400. Its totient is φ = 9555120.

The previous prime is 21021349. The next prime is 21021359. The reversal of 21021352 is 25312012.

It is not an unprimeable number, because it can be changed into a prime (21021359) 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, 119352 + ... + 119527.

It is an arithmetic number, because the mean of its divisors is an integer number (2687400).

Almost surely, 2^21021352 is an apocalyptic number.

21021352 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21021352 is an abundant number, since it is smaller than the sum of its proper divisors (21977048).

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

21021352 is a wasteful number, since it uses less digits than its factorization.

21021352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238896 (or 238892 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21021352 is about 4584.9047972668. The cubic root of 21021352 is about 275.9858915984.

Adding to 21021352 its reverse (25312012), we get a palindrome (46333364).

The spelling of 21021352 in words is "twenty-one million, twenty-one thousand, three hundred fifty-two".