21883973 has 8 divisors (see below), whose sum is σ = 22197240. Its totient is φ = 21572800.

The previous prime is 21883931. The next prime is 21883993. The reversal of 21883973 is 37938812.

It can be written as a sum of positive squares in 4 ways, for example, as 1965604 + 19918369 = 1402^2 + 4463^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21883973 - 2²² = 17689669 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21883973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21883993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39011 + ... + 39567.

It is an arithmetic number, because the mean of its divisors is an integer number (2774655).

Almost surely, 2^21883973 is an apocalyptic number.

It is an amenable number.

21883973 is a deficient number, since it is larger than the sum of its proper divisors (313267).

21883973 is a wasteful number, since it uses less digits than its factorization.

21883973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047.

The product of its digits is 72576, while the sum is 41.

The square root of 21883973 is about 4678.0308891669. The cubic root of 21883973 is about 279.7104702772.

The spelling of 21883973 in words is "twenty-one million, eight hundred eighty-three thousand, nine hundred seventy-three".