21883844 has 6 divisors (see below), whose sum is σ = 38296734. Its totient is φ = 10941920.

The previous prime is 21883837. The next prime is 21883853. The reversal of 21883844 is 44838812.

It can be written as a sum of positive squares in only one way, i.e., 18386944 + 3496900 = 4288^2 + 1870^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21883798 and 21883807.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2735477 + ... + 2735484.

It is an arithmetic number, because the mean of its divisors is an integer number (6382789).

Almost surely, 2^21883844 is an apocalyptic number.

It is an amenable number.

21883844 is a deficient number, since it is larger than the sum of its proper divisors (16412890).

21883844 is a wasteful number, since it uses less digits than its factorization.

21883844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5470965 (or 5470963 counting only the distinct ones).

The product of its digits is 49152, while the sum is 38.

The square root of 21883844 is about 4678.0171012941. The cubic root of 21883844 is about 279.7099206707.

The spelling of 21883844 in words is "twenty-one million, eight hundred eighty-three thousand, eight hundred forty-four".