21884741 has 2 divisors, whose sum is σ = 21884742. Its totient is φ = 21884740.

The previous prime is 21884699. The next prime is 21884747. The reversal of 21884741 is 14748812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11937025 + 9947716 = 3455^2 + 3154^2 .

It is a cyclic number.

It is not a de Polignac number, because 21884741 - 2⁶ = 21884677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21884747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10942370 + 10942371.

It is an arithmetic number, because the mean of its divisors is an integer number (10942371).

Almost surely, 2^21884741 is an apocalyptic number.

It is an amenable number.

21884741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21884741 is an equidigital number, since it uses as much as digits as its factorization.

21884741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14336, while the sum is 35.

The square root of 21884741 is about 4678.1129742664. The cubic root of 21884741 is about 279.7137423084.

The spelling of 21884741 in words is "twenty-one million, eight hundred eighty-four thousand, seven hundred forty-one".