1255403523221 has 2 divisors, whose sum is σ = 1255403523222. Its totient is φ = 1255403523220.

The previous prime is 1255403523193. The next prime is 1255403523229. The reversal of 1255403523221 is 1223253045521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1152209028100 + 103194495121 = 1073410^2 + 321239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255403523221 - 2²⁶ = 1255336414357 is a prime.

It is a super-2 number, since 2×1255403523221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255403523229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627701761610 + 627701761611.

It is an arithmetic number, because the mean of its divisors is an integer number (627701761611).

Almost surely, 2^{1255403523221} is an apocalyptic number.

It is an amenable number.

1255403523221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255403523221 is an equidigital number, since it uses as much as digits as its factorization.

1255403523221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 1255403523221 its reverse (1223253045521), we get a palindrome (2478656568742).

The spelling of 1255403523221 in words is "one trillion, two hundred fifty-five billion, four hundred three million, five hundred twenty-three thousand, two hundred twenty-one".