21323238 has 16 divisors (see below), whose sum is σ = 42851136. Its totient is φ = 7073640.

The previous prime is 21323209. The next prime is 21323261. The reversal of 21323238 is 83232312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7156 + ... + 9687.

It is an arithmetic number, because the mean of its divisors is an integer number (2678196).

Almost surely, 2^21323238 is an apocalyptic number.

21323238 is an abundant number, since it is smaller than the sum of its proper divisors (21527898).

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

21323238 is a wasteful number, since it uses less digits than its factorization.

21323238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17059.

The product of its digits is 1728, while the sum is 24.

The square root of 21323238 is about 4617.7091723061. The cubic root of 21323238 is about 277.3007546302.

The spelling of 21323238 in words is "twenty-one million, three hundred twenty-three thousand, two hundred thirty-eight".