1211122020131 has 4 divisors (see below), whose sum is σ = 1211128674552. Its totient is φ = 1211115365712.

The previous prime is 1211122020109. The next prime is 1211122020133. The reversal of 1211122020131 is 1310202211121.

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 1211122020131 - 2²⁶ = 1211054911267 is a prime.

It is a super-2 number, since 2×1211122020131² (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 (1211122020133) 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, 3046301 + ... + 3420846.

It is an arithmetic number, because the mean of its divisors is an integer number (302782168638).

Almost surely, 2^{1211122020131} is an apocalyptic number.

1211122020131 is a deficient number, since it is larger than the sum of its proper divisors (6654421).

1211122020131 is an equidigital number, since it uses as much as digits as its factorization.

1211122020131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6654420.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1211122020131 its reverse (1310202211121), we get a palindrome (2521324231252).

The spelling of 1211122020131 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, twenty thousand, one hundred thirty-one".