1211340442131 has 12 divisors (see below), whose sum is σ = 1754727483600. Its totient is φ = 805246366320.

The previous prime is 1211340442127. The next prime is 1211340442139. The reversal of 1211340442131 is 1312440431121.

It is a happy number.

1211340442131 is a `hidden beast` number, since 1 + 211 + 3 + 4 + 0 + 442 + 1 + 3 + 1 = 666.

It is not a de Polignac number, because 1211340442131 - 2² = 1211340442127 is a prime.

It is a super-2 number, since 2×1211340442131² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211340442095 and 1211340442104.

It is not an unprimeable number, because it can be changed into a prime (1211340442139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192824055 + ... + 192830336.

It is an arithmetic number, because the mean of its divisors is an integer number (146227290300).

Almost surely, 2^{1211340442131} is an apocalyptic number.

1211340442131 is a deficient number, since it is larger than the sum of its proper divisors (543387041469).

1211340442131 is a wasteful number, since it uses less digits than its factorization.

1211340442131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385654746 (or 385654743 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 1211340442131 its reverse (1312440431121), we get a palindrome (2523780873252).

It can be divided in two parts, 1211340 and 442131, that added together give a triangular number (1653471 = T₁₈₁₈).

The spelling of 1211340442131 in words is "one trillion, two hundred eleven billion, three hundred forty million, four hundred forty-two thousand, one hundred thirty-one".