21332398 has 16 divisors (see below), whose sum is σ = 32639184. Its totient is φ = 10454400.

The previous prime is 21332393. The next prime is 21332401. The reversal of 21332398 is 89323312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52998 + ... + 53398.

It is an arithmetic number, because the mean of its divisors is an integer number (2039949).

Almost surely, 2^21332398 is an apocalyptic number.

21332398 is a deficient number, since it is larger than the sum of its proper divisors (11306786).

21332398 is a wasteful number, since it uses less digits than its factorization.

21332398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867.

The product of its digits is 7776, while the sum is 31.

The square root of 21332398 is about 4618.7008996037. The cubic root of 21332398 is about 277.3404564066.

The spelling of 21332398 in words is "twenty-one million, three hundred thirty-two thousand, three hundred ninety-eight".