21884441 has 2 divisors, whose sum is σ = 21884442. Its totient is φ = 21884440.

The previous prime is 21884437. The next prime is 21884449. The reversal of 21884441 is 14448812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17884441 + 4000000 = 4229^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 21884441 - 2² = 21884437 is a prime.

It is equal to p_1382378 and since 21884441 and 1382378 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 21884398 and 21884407.

It is not a weakly prime, because it can be changed into another prime (21884449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10942220 + 10942221.

It is an arithmetic number, because the mean of its divisors is an integer number (10942221).

Almost surely, 2^21884441 is an apocalyptic number.

It is an amenable number.

21884441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21884441 is an equidigital number, since it uses as much as digits as its factorization.

21884441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8192, while the sum is 32.

The square root of 21884441 is about 4678.0809099459. The cubic root of 21884441 is about 279.7124641804.

The spelling of 21884441 in words is "twenty-one million, eight hundred eighty-four thousand, four hundred forty-one".