21655235114413 has 2 divisors, whose sum is σ = 21655235114414. Its totient is φ = 21655235114412.

The previous prime is 21655235114399. The next prime is 21655235114449. The reversal of 21655235114413 is 31441153255612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21317769391689 + 337465722724 = 4617117^2 + 580918^2 .

It is a cyclic number.

It is not a de Polignac number, because 21655235114413 - 2¹⁷ = 21655234983341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21655235114413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21655235114473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10827617557206 + 10827617557207.

It is an arithmetic number, because the mean of its divisors is an integer number (10827617557207).

Almost surely, 2^{21655235114413} is an apocalyptic number.

It is an amenable number.

21655235114413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21655235114413 is an equidigital number, since it uses as much as digits as its factorization.

21655235114413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432000, while the sum is 43.

The spelling of 21655235114413 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred thirty-five million, one hundred fourteen thousand, four hundred thirteen".