1255423525421 has 16 divisors (see below), whose sum is σ = 1355092778928. Its totient is φ = 1156199616000.

The previous prime is 1255423525403. The next prime is 1255423525427. The reversal of 1255423525421 is 1245253245521.

It can be written as a sum of positive squares in 8 ways, for example, as 240306824521 + 1015116700900 = 490211^2 + 1007530^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1255423525421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255423525427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11123345 + ... + 11235641.

It is an arithmetic number, because the mean of its divisors is an integer number (84693298683).

Almost surely, 2^{1255423525421} is an apocalyptic number.

It is an amenable number.

1255423525421 is a deficient number, since it is larger than the sum of its proper divisors (99669253507).

1255423525421 is a wasteful number, since it uses less digits than its factorization.

1255423525421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114272.

The product of its digits is 480000, while the sum is 41.

The spelling of 1255423525421 in words is "one trillion, two hundred fifty-five billion, four hundred twenty-three million, five hundred twenty-five thousand, four hundred twenty-one".