21345352 has 16 divisors (see below), whose sum is σ = 45740160. Its totient is φ = 9147984.

The previous prime is 21345349. The next prime is 21345367. The reversal of 21345352 is 25354312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190528 + ... + 190639.

It is an arithmetic number, because the mean of its divisors is an integer number (2858760).

Almost surely, 2^21345352 is an apocalyptic number.

It is an amenable number.

21345352 is an abundant number, since it is smaller than the sum of its proper divisors (24394808).

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

21345352 is a wasteful number, since it uses less digits than its factorization.

21345352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381180 (or 381176 counting only the distinct ones).

The product of its digits is 3600, while the sum is 25.

The square root of 21345352 is about 4620.1030291542. The cubic root of 21345352 is about 277.3965829503.

Adding to 21345352 its reverse (25354312), we get a palindrome (46699664).

The spelling of 21345352 in words is "twenty-one million, three hundred forty-five thousand, three hundred fifty-two".