21096653 has 2 divisors, whose sum is σ = 21096654. Its totient is φ = 21096652.

The previous prime is 21096619. The next prime is 21096671. The reversal of 21096653 is 35669012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10843849 + 10252804 = 3293^2 + 3202^2 .

It is a cyclic number.

It is not a de Polignac number, because 21096653 - 2¹⁰ = 21095629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21096683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10548326 + 10548327.

It is an arithmetic number, because the mean of its divisors is an integer number (10548327).

Almost surely, 2^21096653 is an apocalyptic number.

It is an amenable number.

21096653 is a deficient number, since it is larger than the sum of its proper divisors (1).

21096653 is an equidigital number, since it uses as much as digits as its factorization.

21096653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 21096653 is about 4593.1092954555. The cubic root of 21096653 is about 276.3150370681.

The spelling of 21096653 in words is "twenty-one million, ninety-six thousand, six hundred fifty-three".