1211102231031 has 96 divisors (see below), whose sum is σ = 2198096229888. Its totient is φ = 624234885120.

The previous prime is 1211102231029. The next prime is 1211102231123. The reversal of 1211102231031 is 1301322011121.

It is not a de Polignac number, because 1211102231031 - 2¹ = 1211102231029 is a prime.

It is a super-2 number, since 2×1211102231031² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211102230995 and 1211102231013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211102231011) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 69687015 + ... + 69704391.

It is an arithmetic number, because the mean of its divisors is an integer number (22896835728).

Almost surely, 2^{1211102231031} is an apocalyptic number.

1211102231031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211102231031 is a deficient number, since it is larger than the sum of its proper divisors (986993998857).

1211102231031 is a wasteful number, since it uses less digits than its factorization.

1211102231031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18181 (or 18178 counting only the distinct ones).

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

Adding to 1211102231031 its reverse (1301322011121), we get a palindrome (2512424242152).

The spelling of 1211102231031 in words is "one trillion, two hundred eleven billion, one hundred two million, two hundred thirty-one thousand, thirty-one".