1211102331231 has 16 divisors (see below), whose sum is σ = 1814628243456. Its totient is φ = 712889666016.

The previous prime is 1211102331227. The next prime is 1211102331233. The reversal of 1211102331231 is 1321332011121.

It is not a de Polignac number, because 1211102331231 - 2² = 1211102331227 is a prime.

It is a super-2 number, since 2×1211102331231² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211102331198 and 1211102331207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211102331233) 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, 675084015 + ... + 675085808.

It is an arithmetic number, because the mean of its divisors is an integer number (113414265216).

Almost surely, 2^{1211102331231} is an apocalyptic number.

1211102331231 is a deficient number, since it is larger than the sum of its proper divisors (603525912225).

1211102331231 is a wasteful number, since it uses less digits than its factorization.

1211102331231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350169862.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1211102331231 its reverse (1321332011121), we get a palindrome (2532434342352).

The spelling of 1211102331231 in words is "one trillion, two hundred eleven billion, one hundred two million, three hundred thirty-one thousand, two hundred thirty-one".