21983943 has 16 divisors (see below), whose sum is σ = 30758400. Its totient is φ = 13947360.

The previous prime is 21983933. The next prime is 21983947. The reversal of 21983943 is 34938912.

It is not a de Polignac number, because 21983943 - 2⁵ = 21983911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21983947) 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, 4398 + ... + 7956.

It is an arithmetic number, because the mean of its divisors is an integer number (1922400).

Almost surely, 2^21983943 is an apocalyptic number.

21983943 is a deficient number, since it is larger than the sum of its proper divisors (8774457).

21983943 is a wasteful number, since it uses less digits than its factorization.

21983943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3662.

The product of its digits is 46656, while the sum is 39.

The square root of 21983943 is about 4688.7037654345. The cubic root of 21983943 is about 280.1357462533.

The spelling of 21983943 in words is "twenty-one million, nine hundred eighty-three thousand, nine hundred forty-three".