21983859 has 16 divisors (see below), whose sum is σ = 32676000. Its totient is φ = 14607648.

The previous prime is 21983807. The next prime is 21983861. The reversal of 21983859 is 95838912.

It is a happy number.

It is not a de Polignac number, because 21983859 - 2²³ = 13595251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21983869) 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, 8257 + ... + 10589.

It is an arithmetic number, because the mean of its divisors is an integer number (2042250).

Almost surely, 2^21983859 is an apocalyptic number.

21983859 is a deficient number, since it is larger than the sum of its proper divisors (10692141).

21983859 is a wasteful number, since it uses less digits than its factorization.

21983859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691 (or 2685 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 21983859 is about 4688.6948077263. The cubic root of 21983859 is about 280.1353894560.

The spelling of 21983859 in words is "twenty-one million, nine hundred eighty-three thousand, eight hundred fifty-nine".