21926982 has 64 divisors (see below), whose sum is σ = 56475648. Its totient is φ = 5508000.

The previous prime is 21926959. The next prime is 21927011. The reversal of 21926982 is 28962912.

It is a self number, because there is not a number n which added to its sum of digits gives 21926982.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13557 + ... + 15087.

It is an arithmetic number, because the mean of its divisors is an integer number (882432).

Almost surely, 2^21926982 is an apocalyptic number.

21926982 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21926982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28237824).

21926982 is an abundant number, since it is smaller than the sum of its proper divisors (34548666).

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

21926982 is a wasteful number, since it uses less digits than its factorization.

21926982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585.

The product of its digits is 31104, while the sum is 39.

The square root of 21926982 is about 4682.6255455674. The cubic root of 21926982 is about 279.8935905183.

The spelling of 21926982 in words is "twenty-one million, nine hundred twenty-six thousand, nine hundred eighty-two".