21083628653 has 2 divisors, whose sum is σ = 21083628654. Its totient is φ = 21083628652.

The previous prime is 21083628613. The next prime is 21083628659. The reversal of 21083628653 is 35682638012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15675791209 + 5407837444 = 125203^2 + 73538^2 .

It is a cyclic number.

It is not a de Polignac number, because 21083628653 - 2¹² = 21083624557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21083628659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541814326 + 10541814327.

It is an arithmetic number, because the mean of its divisors is an integer number (10541814327).

Almost surely, 2^21083628653 is an apocalyptic number.

It is an amenable number.

21083628653 is a deficient number, since it is larger than the sum of its proper divisors (1).

21083628653 is an equidigital number, since it uses as much as digits as its factorization.

21083628653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 21083628653 in words is "twenty-one billion, eighty-three million, six hundred twenty-eight thousand, six hundred fifty-three".