21293982 has 32 divisors (see below), whose sum is σ = 47900160. Its totient is φ = 7011000.

The previous prime is 21293977. The next prime is 21293983. The reversal of 21293982 is 28939212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21293983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2107 + ... + 6857.

It is an arithmetic number, because the mean of its divisors is an integer number (1496880).

Almost surely, 2^21293982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21293982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23950080).

21293982 is an abundant number, since it is smaller than the sum of its proper divisors (26606178).

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

21293982 is a wasteful number, since it uses less digits than its factorization.

21293982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4845 (or 4839 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21293982 is about 4614.5402804613. The cubic root of 21293982 is about 277.1738754638.

The spelling of 21293982 in words is "twenty-one million, two hundred ninety-three thousand, nine hundred eighty-two".