21882216 has 32 divisors (see below), whose sum is σ = 55740960. Its totient is φ = 7156032.

The previous prime is 21882209. The next prime is 21882221. The reversal of 21882216 is 61228812.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7330 + ... + 9873.

It is an arithmetic number, because the mean of its divisors is an integer number (1741905).

Almost surely, 2^21882216 is an apocalyptic number.

It is an amenable number.

21882216 is an abundant number, since it is smaller than the sum of its proper divisors (33858744).

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

21882216 is a wasteful number, since it uses less digits than its factorization.

21882216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17265 (or 17261 counting only the distinct ones).

The product of its digits is 3072, while the sum is 30.

The square root of 21882216 is about 4677.8430927084. The cubic root of 21882216 is about 279.7029843658.

The spelling of 21882216 in words is "twenty-one million, eight hundred eighty-two thousand, two hundred sixteen".