1211031012231 has 56 divisors (see below), whose sum is σ = 1836387248960. Its totient is φ = 798195093696.

The previous prime is 1211031012211. The next prime is 1211031012241. The reversal of 1211031012231 is 1322101301121.

1211031012231 is a `hidden beast` number, since 1 + 2 + 110 + 310 + 12 + 231 = 666.

It is not a de Polignac number, because 1211031012231 - 2²¹ = 1211028915079 is a prime.

It is a super-2 number, since 2×1211031012231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211031012211) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 36773985 + ... + 36806901.

Almost surely, 2^{1211031012231} is an apocalyptic number.

1211031012231 is a deficient number, since it is larger than the sum of its proper divisors (625356236729).

1211031012231 is an equidigital number, since it uses as much as digits as its factorization.

1211031012231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33507 (or 33492 counting only the distinct ones).

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

Adding to 1211031012231 its reverse (1322101301121), we get a palindrome (2533132313352).

The spelling of 1211031012231 in words is "one trillion, two hundred eleven billion, thirty-one million, twelve thousand, two hundred thirty-one".