21653513353 has 2 divisors, whose sum is σ = 21653513354. Its totient is φ = 21653513352.

The previous prime is 21653513351. The next prime is 21653513363. The reversal of 21653513353 is 35331535612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20422696464 + 1230816889 = 142908^2 + 35083^2 .

It is a cyclic number.

It is not a de Polignac number, because 21653513353 - 2¹ = 21653513351 is a prime.

Together with 21653513351, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21653513351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10826756676 + 10826756677.

It is an arithmetic number, because the mean of its divisors is an integer number (10826756677).

Almost surely, 2^21653513353 is an apocalyptic number.

It is an amenable number.

21653513353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21653513353 is an equidigital number, since it uses as much as digits as its factorization.

21653513353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121500, while the sum is 37.

The spelling of 21653513353 in words is "twenty-one billion, six hundred fifty-three million, five hundred thirteen thousand, three hundred fifty-three".