1231224221251 has 2 divisors, whose sum is σ = 1231224221252. Its totient is φ = 1231224221250.

The previous prime is 1231224221237. The next prime is 1231224221321. The reversal of 1231224221251 is 1521224221321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231224221251 - 2⁹ = 1231224220739 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231224221231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615612110625 + 615612110626.

It is an arithmetic number, because the mean of its divisors is an integer number (615612110626).

Almost surely, 2^{1231224221251} is an apocalyptic number.

1231224221251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231224221251 is an equidigital number, since it uses as much as digits as its factorization.

1231224221251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 28.

Adding to 1231224221251 its reverse (1521224221321), we get a palindrome (2752448442572).

The spelling of 1231224221251 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-four million, two hundred twenty-one thousand, two hundred fifty-one".