21883841 has 6 divisors (see below), whose sum is σ = 25456770. Its totient is φ = 18757536.

The previous prime is 21883837. The next prime is 21883853. The reversal of 21883841 is 14838812.

It can be written as a sum of positive squares in only one way, i.e., 12397441 + 9486400 = 3521^2 + 3080^2 .

It is not a de Polignac number, because 21883841 - 2² = 21883837 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 (21883871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223256 + ... + 223353.

It is an arithmetic number, because the mean of its divisors is an integer number (4242795).

Almost surely, 2^21883841 is an apocalyptic number.

It is an amenable number.

21883841 is a deficient number, since it is larger than the sum of its proper divisors (3572929).

21883841 is an equidigital number, since it uses as much as digits as its factorization.

21883841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446623 (or 446616 counting only the distinct ones).

The product of its digits is 12288, while the sum is 35.

The square root of 21883841 is about 4678.0167806454. The cubic root of 21883841 is about 279.7099078892.

The spelling of 21883841 in words is "twenty-one million, eight hundred eighty-three thousand, eight hundred forty-one".