21653037453373 has 2 divisors, whose sum is σ = 21653037453374. Its totient is φ = 21653037453372.

The previous prime is 21653037453367. The next prime is 21653037453457. The reversal of 21653037453373 is 37335473035612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17712423383769 + 3940614069604 = 4208613^2 + 1985098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21653037453373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21653037453373.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21653037453343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10826518726686 + 10826518726687.

It is an arithmetic number, because the mean of its divisors is an integer number (10826518726687).

Almost surely, 2^{21653037453373} is an apocalyptic number.

It is an amenable number.

21653037453373 is a deficient number, since it is larger than the sum of its proper divisors (1).

21653037453373 is an equidigital number, since it uses as much as digits as its factorization.

21653037453373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14288400, while the sum is 52.

The spelling of 21653037453373 in words is "twenty-one trillion, six hundred fifty-three billion, thirty-seven million, four hundred fifty-three thousand, three hundred seventy-three".