1211312233131 has 96 divisors (see below), whose sum is σ = 2266882507008. Its totient is φ = 565150037760.

The previous prime is 1211312233093. The next prime is 1211312233133. The reversal of 1211312233131 is 1313322131121.

It is not a de Polignac number, because 1211312233131 - 2¹³ = 1211312224939 is a prime.

It is a super-2 number, since 2×1211312233131² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211312233133) 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, 925 + ... + 1556478.

It is an arithmetic number, because the mean of its divisors is an integer number (23613359448).

Almost surely, 2^{1211312233131} is an apocalyptic number.

1211312233131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211312233131 is a deficient number, since it is larger than the sum of its proper divisors (1055570273877).

1211312233131 is a wasteful number, since it uses less digits than its factorization.

1211312233131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557481 (or 1557474 counting only the distinct ones).

The product of its digits is 648, while the sum is 24.

Adding to 1211312233131 its reverse (1313322131121), we get a palindrome (2524634364252).

The spelling of 1211312233131 in words is "one trillion, two hundred eleven billion, three hundred twelve million, two hundred thirty-three thousand, one hundred thirty-one".