21332238 has 16 divisors (see below), whose sum is σ = 42826320. Its totient is φ = 7083776.

The previous prime is 21332221. The next prime is 21332251. The reversal of 21332238 is 83223312.

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, 4995 + ... + 8222.

It is an arithmetic number, because the mean of its divisors is an integer number (2676645).

Almost surely, 2^21332238 is an apocalyptic number.

21332238 is an abundant number, since it is smaller than the sum of its proper divisors (21494082).

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

21332238 is a wasteful number, since it uses less digits than its factorization.

21332238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13491.

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

The square root of 21332238 is about 4618.6835786834. The cubic root of 21332238 is about 277.3397630233.

It can be divided in two parts, 2133 and 2238, that added together give a triangular number (4371 = T₉₃).

The spelling of 21332238 in words is "twenty-one million, three hundred thirty-two thousand, two hundred thirty-eight".