1131231021211 has 4 divisors (see below), whose sum is σ = 1132551011592. Its totient is φ = 1129911030832.

The previous prime is 1131231021169. The next prime is 1131231021223. The reversal of 1131231021211 is 1121201321311.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131231021211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131231021311) 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, 659993905 + ... + 659995618.

It is an arithmetic number, because the mean of its divisors is an integer number (283137752898).

Almost surely, 2^{1131231021211} is an apocalyptic number.

1131231021211 is a deficient number, since it is larger than the sum of its proper divisors (1319990381).

1131231021211 is an equidigital number, since it uses as much as digits as its factorization.

1131231021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319990380.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1131231021211 its reverse (1121201321311), we get a palindrome (2252432342522).

The spelling of 1131231021211 in words is "one trillion, one hundred thirty-one billion, two hundred thirty-one million, twenty-one thousand, two hundred eleven".