21464976 has 80 divisors (see below), whose sum is σ = 61246080. Its totient is φ = 6435840.

The previous prime is 21464953. The next prime is 21464983. The reversal of 21464976 is 67946412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25165 + ... + 26003.

It is an arithmetic number, because the mean of its divisors is an integer number (765576).

Almost surely, 2^21464976 is an apocalyptic number.

21464976 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 21464976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30623040).

21464976 is an abundant number, since it is smaller than the sum of its proper divisors (39781104).

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

21464976 is a wasteful number, since it uses less digits than its factorization.

21464976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904 (or 898 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 21464976 is about 4633.0309733478. The cubic root of 21464976 is about 277.9138148724.

The spelling of 21464976 in words is "twenty-one million, four hundred sixty-four thousand, nine hundred seventy-six".