21398352 has 20 divisors (see below), whose sum is σ = 55279200. Its totient is φ = 7132768.

The previous prime is 21398347. The next prime is 21398371. The reversal of 21398352 is 25389312.

It is a congruent number.

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, 222852 + ... + 222947.

It is an arithmetic number, because the mean of its divisors is an integer number (2763960).

Almost surely, 2^21398352 is an apocalyptic number.

It is an amenable number.

21398352 is an abundant number, since it is smaller than the sum of its proper divisors (33880848).

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

21398352 is a wasteful number, since it uses less digits than its factorization.

21398352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445810 (or 445804 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 21398352 is about 4625.8352759259. The cubic root of 21398352 is about 277.6259828902.

The spelling of 21398352 in words is "twenty-one million, three hundred ninety-eight thousand, three hundred fifty-two".