21983479 has 8 divisors (see below), whose sum is σ = 25990560. Its totient is φ = 18193056.

The previous prime is 21983453. The next prime is 21983483. The reversal of 21983479 is 97438912.

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

It is not a de Polignac number, because 21983479 - 2⁹ = 21982967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21983179) 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, 53944 + ... + 54349.

It is an arithmetic number, because the mean of its divisors is an integer number (3248820).

Almost surely, 2^21983479 is an apocalyptic number.

21983479 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21983479 is a deficient number, since it is larger than the sum of its proper divisors (4007081).

21983479 is a wasteful number, since it uses less digits than its factorization.

21983479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108329.

The product of its digits is 108864, while the sum is 43.

The square root of 21983479 is about 4688.6542845469. The cubic root of 21983479 is about 280.1337753618.

The spelling of 21983479 in words is "twenty-one million, nine hundred eighty-three thousand, four hundred seventy-nine".