1231231002121 has 4 divisors (see below), whose sum is σ = 1231394367892. Its totient is φ = 1231067636352.

The previous prime is 1231231002101. The next prime is 1231231002217. The reversal of 1231231002121 is 1212001321321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 860879642896 + 370351359225 = 927836^2 + 608565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231231002121 - 2³⁷ = 1093792048649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231231002101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81671580 + ... + 81686653.

It is an arithmetic number, because the mean of its divisors is an integer number (307848591973).

Almost surely, 2^{1231231002121} is an apocalyptic number.

It is an amenable number.

1231231002121 is a deficient number, since it is larger than the sum of its proper divisors (163365771).

1231231002121 is an equidigital number, since it uses as much as digits as its factorization.

1231231002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163365770.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1231231002121 its reverse (1212001321321), we get a palindrome (2443232323442).

The spelling of 1231231002121 in words is "one trillion, two hundred thirty-one billion, two hundred thirty-one million, two thousand, one hundred twenty-one".