1231230121001 has 8 divisors (see below), whose sum is σ = 1273704973320. Its totient is φ = 1188756511488.

The previous prime is 1231230120973. The next prime is 1231230121013. The reversal of 1231230121001 is 1001210321321.

It can be written as a sum of positive squares in 4 ways, for example, as 182285448601 + 1048944672400 = 426949^2 + 1024180^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231230121001 is a prime.

It is a super-2 number, since 2×1231230121001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231230121021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1994945 + ... + 2538161.

It is an arithmetic number, because the mean of its divisors is an integer number (159213121665).

Almost surely, 2^{1231230121001} is an apocalyptic number.

It is an amenable number.

1231230121001 is a deficient number, since it is larger than the sum of its proper divisors (42474852319).

1231230121001 is an equidigital number, since it uses as much as digits as its factorization.

1231230121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621403.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1231230121001 its reverse (1001210321321), we get a palindrome (2232440442322).

The spelling of 1231230121001 in words is "one trillion, two hundred thirty-one billion, two hundred thirty million, one hundred twenty-one thousand, one".