21422976 has 64 divisors (see below), whose sum is σ = 58164480. Its totient is φ = 6983168.

The previous prime is 21422939. The next prime is 21422993. The reversal of 21422976 is 67922412.

It is a tau number, because it is divible by the number of its divisors (64).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 17455 + ... + 18641.

It is an arithmetic number, because the mean of its divisors is an integer number (908820).

Almost surely, 2^21422976 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 21422976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29082240).

21422976 is an abundant number, since it is smaller than the sum of its proper divisors (36741504).

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

21422976 is a wasteful number, since it uses less digits than its factorization.

21422976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251 (or 1239 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 21422976 is about 4628.4960840429. The cubic root of 21422976 is about 277.7324341038.

The spelling of 21422976 in words is "twenty-one million, four hundred twenty-two thousand, nine hundred seventy-six".