21374232 has 32 divisors (see below), whose sum is σ = 58294080. Its totient is φ = 6476960.

The previous prime is 21374231. The next prime is 21374233. The reversal of 21374232 is 23247312.

It is an interprime number because it is at equal distance from previous prime (21374231) and next prime (21374233).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40218 + ... + 40745.

It is an arithmetic number, because the mean of its divisors is an integer number (1821690).

Almost surely, 2^21374232 is an apocalyptic number.

21374232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21374232 is an abundant number, since it is smaller than the sum of its proper divisors (36919848).

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

21374232 is a wasteful number, since it uses less digits than its factorization.

21374232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80983 (or 80979 counting only the distinct ones).

The product of its digits is 2016, while the sum is 24.

The square root of 21374232 is about 4623.2274441130. The cubic root of 21374232 is about 277.5216312981.

Subtracting 21374232 from its reverse (23247312), we obtain a triangular number (1873080 = T₁₉₃₅).

The spelling of 21374232 in words is "twenty-one million, three hundred seventy-four thousand, two hundred thirty-two".