21903919197353 has 2 divisors, whose sum is σ = 21903919197354. Its totient is φ = 21903919197352.

The previous prime is 21903919197311. The next prime is 21903919197421. The reversal of 21903919197353 is 35379191930912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21901014741904 + 2904455449 = 4679852^2 + 53893^2 .

It is a cyclic number.

It is not a de Polignac number, because 21903919197353 - 2²⁴ = 21903902420137 is a prime.

It is not a weakly prime, because it can be changed into another prime (21903919197653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10951959598676 + 10951959598677.

It is an arithmetic number, because the mean of its divisors is an integer number (10951959598677).

Almost surely, 2^{21903919197353} is an apocalyptic number.

It is an amenable number.

21903919197353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21903919197353 is an equidigital number, since it uses as much as digits as its factorization.

21903919197353 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12400290, while the sum is 62.

The spelling of 21903919197353 in words is "twenty-one trillion, nine hundred three billion, nine hundred nineteen million, one hundred ninety-seven thousand, three hundred fifty-three".