1211112012131 has 4 divisors (see below), whose sum is σ = 1384128013872. Its totient is φ = 1038096010392.

The previous prime is 1211112012119. The next prime is 1211112012151. The reversal of 1211112012131 is 1312102111121.

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

It is not a de Polignac number, because 1211112012131 - 2³⁴ = 1193932142947 is a prime.

It is a super-2 number, since 2×1211112012131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211112012151) 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, 86508000860 + ... + 86508000873.

It is an arithmetic number, because the mean of its divisors is an integer number (346032003468).

Almost surely, 2^{1211112012131} is an apocalyptic number.

1211112012131 is a deficient number, since it is larger than the sum of its proper divisors (173016001741).

1211112012131 is an equidigital number, since it uses as much as digits as its factorization.

1211112012131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173016001740.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 1211112012131 its reverse (1312102111121), we get a palindrome (2523214123252).

The spelling of 1211112012131 in words is "one trillion, two hundred eleven billion, one hundred twelve million, twelve thousand, one hundred thirty-one".