21255241354433 has 2 divisors, whose sum is σ = 21255241354434. Its totient is φ = 21255241354432.

The previous prime is 21255241354423. The next prime is 21255241354453. The reversal of 21255241354433 is 33445314255212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19244426601409 + 2010814753024 = 4386847^2 + 1418032^2 .

It is a cyclic number.

It is not a de Polignac number, because 21255241354433 - 2¹⁴ = 21255241338049 is a prime.

It is not a weakly prime, because it can be changed into another prime (21255241354423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627620677216 + 10627620677217.

It is an arithmetic number, because the mean of its divisors is an integer number (10627620677217).

Almost surely, 2^{21255241354433} is an apocalyptic number.

It is an amenable number.

21255241354433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21255241354433 is an equidigital number, since it uses as much as digits as its factorization.

21255241354433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728000, while the sum is 44.

The spelling of 21255241354433 in words is "twenty-one trillion, two hundred fifty-five billion, two hundred forty-one million, three hundred fifty-four thousand, four hundred thirty-three".