21293376 has 112 divisors (see below), whose sum is σ = 64008000. Its totient is φ = 6193152.

The previous prime is 21293353. The next prime is 21293387. The reversal of 21293376 is 67339212.

It is a happy number.

It is a super-2 number, since 2×21293376² = 906815722954752, which contains 22 as substring.

Its product of digits (13608) is a multiple of the sum of its prime divisors (486).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47200 + ... + 47648.

It is an arithmetic number, because the mean of its divisors is an integer number (571500).

Almost surely, 2^21293376 is an apocalyptic number.

21293376 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21293376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32004000).

21293376 is an abundant number, since it is smaller than the sum of its proper divisors (42714624).

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

21293376 is a wasteful number, since it uses less digits than its factorization.

21293376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 486 counting only the distinct ones).

The product of its digits is 13608, while the sum is 33.

The square root of 21293376 is about 4614.4746179820. The cubic root of 21293376 is about 277.1712460987.

The spelling of 21293376 in words is "twenty-one million, two hundred ninety-three thousand, three hundred seventy-six".