21479976 has 192 divisors, whose sum is σ = 74131200. Its totient is φ = 5474304.

The previous prime is 21479963. The next prime is 21480001. The reversal of 21479976 is 67997412.

It is a super-2 number, since 2×21479976² = 922778737921152, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

Its product of digits (190512) is a multiple of the sum of its prime factors (168).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 197010 + ... + 197118.

It is an arithmetic number, because the mean of its divisors is an integer number (386100).

Almost surely, 2^21479976 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 21479976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37065600).

21479976 is an abundant number, since it is smaller than the sum of its proper divisors (52651224).

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

21479976 is a wasteful number, since it uses less digits than its factorization.

21479976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 161 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 21479976 is about 4634.6495013108. The cubic root of 21479976 is about 277.9785363758.

The spelling of 21479976 in words is "twenty-one million, four hundred seventy-nine thousand, nine hundred seventy-six".