21046374 has 48 divisors (see below), whose sum is σ = 48803040. Its totient is φ = 6531840.

The previous prime is 21046367. The next prime is 21046387. The reversal of 21046374 is 47364012.

21046374 is a `hidden beast` number, since 21 + 0 + 4 + 637 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33039 + ... + 33669.

It is an arithmetic number, because the mean of its divisors is an integer number (1016730).

Almost surely, 2^21046374 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21046374, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24401520).

21046374 is an abundant number, since it is smaller than the sum of its proper divisors (27756666).

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

21046374 is a wasteful number, since it uses less digits than its factorization.

21046374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 21046374 is about 4587.6327228757. The cubic root of 21046374 is about 276.0953514276.

The spelling of 21046374 in words is "twenty-one million, forty-six thousand, three hundred seventy-four".