21972182 has 8 divisors (see below), whose sum is σ = 33031152. Its totient is φ = 10961800.

The previous prime is 21972173. The next prime is 21972217. The reversal of 21972182 is 28127912.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21972182² = 965553563682248, which contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 10994 + ... + 12837.

It is an arithmetic number, because the mean of its divisors is an integer number (4128894).

Almost surely, 2^21972182 is an apocalyptic number.

21972182 is a deficient number, since it is larger than the sum of its proper divisors (11058970).

21972182 is a wasteful number, since it uses less digits than its factorization.

21972182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24294.

The product of its digits is 4032, while the sum is 32.

The square root of 21972182 is about 4687.4494130604. The cubic root of 21972182 is about 280.0857815402.

The spelling of 21972182 in words is "twenty-one million, nine hundred seventy-two thousand, one hundred eighty-two".