1231042300121 has 4 divisors (see below), whose sum is σ = 1231061434932. Its totient is φ = 1231023165312.

The previous prime is 1231042300069. The next prime is 1231042300127. The reversal of 1231042300121 is 1210032401321.

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 520654606096 + 710387694025 = 721564^2 + 842845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231042300121 is a prime.

It is a super-2 number, since 2×1231042300121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231042300093 and 1231042300102.

It is not an unprimeable number, because it can be changed into a prime (1231042300127) 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, 9470576 + ... + 9599681.

It is an arithmetic number, because the mean of its divisors is an integer number (307765358733).

Almost surely, 2^{1231042300121} is an apocalyptic number.

It is an amenable number.

1231042300121 is a deficient number, since it is larger than the sum of its proper divisors (19134811).

1231042300121 is an equidigital number, since it uses as much as digits as its factorization.

1231042300121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19134810.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1231042300121 its reverse (1210032401321), we get a palindrome (2441074701442).

The spelling of 1231042300121 in words is "one trillion, two hundred thirty-one billion, forty-two million, three hundred thousand, one hundred twenty-one".