1200111211031 has 4 divisors (see below), whose sum is σ = 1263274959000. Its totient is φ = 1136947463064.

The previous prime is 1200111211007. The next prime is 1200111211037. The reversal of 1200111211031 is 1301121110021.

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-1200111211031 is a prime.

It is a super-2 number, since 2×1200111211031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200111210997 and 1200111211015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200111211037) 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, 31581873956 + ... + 31581873993.

It is an arithmetic number, because the mean of its divisors is an integer number (315818739750).

Almost surely, 2^{1200111211031} is an apocalyptic number.

1200111211031 is a deficient number, since it is larger than the sum of its proper divisors (63163747969).

1200111211031 is an equidigital number, since it uses as much as digits as its factorization.

1200111211031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63163747968.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 1200111211031 its reverse (1301121110021), we get a palindrome (2501232321052).

The spelling of 1200111211031 in words is "one trillion, two hundred billion, one hundred eleven million, two hundred eleven thousand, thirty-one".