21830976 has 84 divisors (see below), whose sum is σ = 63239904. Its totient is φ = 7200000.

The previous prime is 21830969. The next prime is 21830987. The reversal of 21830976 is 67903812.

It is a super-2 number, since 2×21830976² = 953183026225152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21830976.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86851 + ... + 87101.

It is an arithmetic number, because the mean of its divisors is an integer number (752856).

Almost surely, 2^21830976 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 21830976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31619952).

21830976 is an abundant number, since it is smaller than the sum of its proper divisors (41408928).

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

21830976 is a wasteful number, since it uses less digits than its factorization.

21830976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 21830976 is about 4672.3629995967. The cubic root of 21830976 is about 279.4844936637.

The spelling of 21830976 in words is "twenty-one million, eight hundred thirty thousand, nine hundred seventy-six".