21823982 has 8 divisors (see below), whose sum is σ = 33291000. Its totient is φ = 10726984.

The previous prime is 21823981. The next prime is 21824009. The reversal of 21823982 is 28932812.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21823981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92357 + ... + 92592.

It is an arithmetic number, because the mean of its divisors is an integer number (4161375).

Almost surely, 2^21823982 is an apocalyptic number.

21823982 is a deficient number, since it is larger than the sum of its proper divisors (11467018).

21823982 is a wasteful number, since it uses less digits than its factorization.

21823982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185010.

The product of its digits is 13824, while the sum is 35.

The square root of 21823982 is about 4671.6144960816. The cubic root of 21823982 is about 279.4546442831.

The spelling of 21823982 in words is "twenty-one million, eight hundred twenty-three thousand, nine hundred eighty-two".