1231134424221 has 16 divisors (see below), whose sum is σ = 1871769985344. Its totient is φ = 713055231744.

The previous prime is 1231134424207. The next prime is 1231134424243. The reversal of 1231134424221 is 1224244311321.

It is a happy number.

It is not a de Polignac number, because 1231134424221 - 2⁵ = 1231134424189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231134424321) 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, 928456671 + ... + 928457996.

It is an arithmetic number, because the mean of its divisors is an integer number (116985624084).

Almost surely, 2^{1231134424221} is an apocalyptic number.

It is an amenable number.

1231134424221 is a deficient number, since it is larger than the sum of its proper divisors (640635561123).

1231134424221 is a wasteful number, since it uses less digits than its factorization.

1231134424221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856914700.

The product of its digits is 9216, while the sum is 30.

Adding to 1231134424221 its reverse (1224244311321), we get a palindrome (2455378735542).

The spelling of 1231134424221 in words is "one trillion, two hundred thirty-one billion, one hundred thirty-four million, four hundred twenty-four thousand, two hundred twenty-one".