21455353 has 2 divisors, whose sum is σ = 21455354. Its totient is φ = 21455352.

The previous prime is 21455327. The next prime is 21455363. The reversal of 21455353 is 35355412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11888704 + 9566649 = 3448^2 + 3093^2 .

It is a cyclic number.

It is not a de Polignac number, because 21455353 - 2⁵ = 21455321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21455363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727676 + 10727677.

It is an arithmetic number, because the mean of its divisors is an integer number (10727677).

Almost surely, 2^21455353 is an apocalyptic number.

It is an amenable number.

21455353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21455353 is an equidigital number, since it uses as much as digits as its factorization.

21455353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 28.

The square root of 21455353 is about 4631.9923359177. The cubic root of 21455353 is about 277.8722779925.

The spelling of 21455353 in words is "twenty-one million, four hundred fifty-five thousand, three hundred fifty-three".