1255423432221 has 24 divisors (see below), whose sum is σ = 2128457062784. Its totient is φ = 697996038240.

The previous prime is 1255423432217. The next prime is 1255423432301. The reversal of 1255423432221 is 1222343245521.

1255423432221 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 423 + 4 + 3 + 2 + 221 = 666.

It is not a de Polignac number, because 1255423432221 - 2² = 1255423432217 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 (1255423432121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 269286265 + ... + 269290926.

Almost surely, 2^{1255423432221} is an apocalyptic number.

It is an amenable number.

1255423432221 is a deficient number, since it is larger than the sum of its proper divisors (873033630563).

1255423432221 is a wasteful number, since it uses less digits than its factorization.

1255423432221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538577241 (or 538577238 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

Adding to 1255423432221 its reverse (1222343245521), we get a palindrome (2477766677742).

The spelling of 1255423432221 in words is "one trillion, two hundred fifty-five billion, four hundred twenty-three million, four hundred thirty-two thousand, two hundred twenty-one".