21456341 has 2 divisors, whose sum is σ = 21456342. Its totient is φ = 21456340.

The previous prime is 21456319. The next prime is 21456349. The reversal of 21456341 is 14365412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16851025 + 4605316 = 4105^2 + 2146^2 .

It is a cyclic number.

It is not a de Polignac number, because 21456341 - 2¹⁸ = 21194197 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 21456341.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21456349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10728170 + 10728171.

It is an arithmetic number, because the mean of its divisors is an integer number (10728171).

Almost surely, 2^21456341 is an apocalyptic number.

It is an amenable number.

21456341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21456341 is an equidigital number, since it uses as much as digits as its factorization.

21456341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 21456341 is about 4632.0989842619. The cubic root of 21456341 is about 277.8765431844.

The spelling of 21456341 in words is "twenty-one million, four hundred fifty-six thousand, three hundred forty-one".