21983982 has 16 divisors (see below), whose sum is σ = 44014080. Its totient is φ = 7320312.

The previous prime is 21983981. The next prime is 21983987. The reversal of 21983982 is 28938912.

It is a super-3 number, since 3×21983982³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21983981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9513 + ... + 11595.

It is an arithmetic number, because the mean of its divisors is an integer number (2750880).

Almost surely, 2^21983982 is an apocalyptic number.

21983982 is an abundant number, since it is smaller than the sum of its proper divisors (22030098).

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

21983982 is a wasteful number, since it uses less digits than its factorization.

21983982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3847.

The product of its digits is 62208, while the sum is 42.

The square root of 21983982 is about 4688.7079243647. The cubic root of 21983982 is about 280.1359119089.

The spelling of 21983982 in words is "twenty-one million, nine hundred eighty-three thousand, nine hundred eighty-two".