1211011230031 has 4 divisors (see below), whose sum is σ = 1211033939112. Its totient is φ = 1210988520952.

The previous prime is 1211011229971. The next prime is 1211011230043. The reversal of 1211011230031 is 1300321101121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211011230031 - 2¹¹ = 1211011227983 is a prime.

It is a super-2 number, since 2×1211011230031² (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 = 1211011229987 and 1211011230014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211011237031) 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, 11274361 + ... + 11381266.

It is an arithmetic number, because the mean of its divisors is an integer number (302758484778).

Almost surely, 2^{1211011230031} is an apocalyptic number.

1211011230031 is a deficient number, since it is larger than the sum of its proper divisors (22709081).

1211011230031 is an equidigital number, since it uses as much as digits as its factorization.

1211011230031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22709080.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1211011230031 its reverse (1300321101121), we get a palindrome (2511332331152).

The spelling of 1211011230031 in words is "one trillion, two hundred eleven billion, eleven million, two hundred thirty thousand, thirty-one".