21348312 has 32 divisors (see below), whose sum is σ = 53534400. Its totient is φ = 7094304.

The previous prime is 21348307. The next prime is 21348323. The reversal of 21348312 is 21384312.

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

It is a nude number because it is divisible by every one of its digits.

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, 7923 + ... + 10269.

It is an arithmetic number, because the mean of its divisors is an integer number (1672950).

Almost surely, 2^21348312 is an apocalyptic number.

It is an amenable number.

21348312 is an abundant number, since it is smaller than the sum of its proper divisors (32186088).

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

21348312 is a wasteful number, since it uses less digits than its factorization.

21348312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2735 (or 2731 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 21348312 is about 4620.4233572260. The cubic root of 21348312 is about 277.4094047258.

The spelling of 21348312 in words is "twenty-one million, three hundred forty-eight thousand, three hundred twelve".