1231211231001 has 16 divisors (see below), whose sum is σ = 1903321710720. Its totient is φ = 785120204880.

The previous prime is 1231211230993. The next prime is 1231211231023. The reversal of 1231211231001 is 1001321121321.

It is not a de Polignac number, because 1231211231001 - 2³ = 1231211230993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231211232001) 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, 991312770 + ... + 991314011.

It is an arithmetic number, because the mean of its divisors is an integer number (118957606920).

Almost surely, 2^{1231211231001} is an apocalyptic number.

It is an amenable number.

1231211231001 is a deficient number, since it is larger than the sum of its proper divisors (672110479719).

1231211231001 is a wasteful number, since it uses less digits than its factorization.

1231211231001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982626813 (or 1982626807 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1231211231001 its reverse (1001321121321), we get a palindrome (2232532352322).

The spelling of 1231211231001 in words is "one trillion, two hundred thirty-one billion, two hundred eleven million, two hundred thirty-one thousand, one".