21323392 has 32 divisors (see below), whose sum is σ = 44333280. Its totient is φ = 10196736.

The previous prime is 21323371. The next prime is 21323417. The reversal of 21323392 is 29332312.

It is a tau number, because it is divible by the number of its divisors (32).

It is a plaindrome in base 13.

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, 678 + ... + 6565.

It is an arithmetic number, because the mean of its divisors is an integer number (1385415).

Almost surely, 2^21323392 is an apocalyptic number.

It is an amenable number.

21323392 is an abundant number, since it is smaller than the sum of its proper divisors (23009888).

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

21323392 is an equidigital number, since it uses as much as digits as its factorization.

21323392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7280 (or 7268 counting only the distinct ones).

The product of its digits is 1944, while the sum is 25.

The square root of 21323392 is about 4617.7258472109. The cubic root of 21323392 is about 277.3014221994.

The spelling of 21323392 in words is "twenty-one million, three hundred twenty-three thousand, three hundred ninety-two".