21374976 has 144 divisors (see below), whose sum is σ = 67223520. Its totient is φ = 6021120.

The previous prime is 21374971. The next prime is 21375007. The reversal of 21374976 is 67947312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 301021 + ... + 301091.

It is an arithmetic number, because the mean of its divisors is an integer number (466830).

Almost surely, 2^21374976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21374976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33611760).

21374976 is an abundant number, since it is smaller than the sum of its proper divisors (45848544).

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

21374976 is an equidigital number, since it uses as much as digits as its factorization.

21374976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 83 counting only the distinct ones).

The product of its digits is 63504, while the sum is 39.

The square root of 21374976 is about 4623.3079066833. The cubic root of 21374976 is about 277.5248512765.

It can be divided in two parts, 21 and 374976, that multiplied together give a triangular number (7874496 = T₃₉₆₈).

The spelling of 21374976 in words is "twenty-one million, three hundred seventy-four thousand, nine hundred seventy-six".