21612982 has 8 divisors (see below), whose sum is σ = 32452416. Its totient is φ = 10795512.

The previous prime is 21612977. The next prime is 21612989. The reversal of 21612982 is 28921612.

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

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612989) by changing a digit.

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, 2758 + ... + 7129.

It is an arithmetic number, because the mean of its divisors is an integer number (4056552).

Almost surely, 2^21612982 is an apocalyptic number.

21612982 is a deficient number, since it is larger than the sum of its proper divisors (10839434).

21612982 is a wasteful number, since it uses less digits than its factorization.

21612982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10982.

The product of its digits is 3456, while the sum is 31.

The square root of 21612982 is about 4648.9764464880. The cubic root of 21612982 is about 278.5511124597.

The spelling of 21612982 in words is "twenty-one million, six hundred twelve thousand, nine hundred eighty-two".