1231130021111 has 4 divisors (see below), whose sum is σ = 1231239184800. Its totient is φ = 1231020857424.

The previous prime is 1231130021071. The next prime is 1231130021159. The reversal of 1231130021111 is 1111200311321.

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 1231130021111 - 2¹⁸ = 1231129758967 is a prime.

It is a super-2 number, since 2×1231130021111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231130021111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231130021171) 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, 54564926 + ... + 54587483.

It is an arithmetic number, because the mean of its divisors is an integer number (307809796200).

Almost surely, 2^{1231130021111} is an apocalyptic number.

1231130021111 is a deficient number, since it is larger than the sum of its proper divisors (109163689).

1231130021111 is a wasteful number, since it uses less digits than its factorization.

1231130021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109163688.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 1231130021111 its reverse (1111200311321), we get a palindrome (2342330332432).

The spelling of 1231130021111 in words is "one trillion, two hundred thirty-one billion, one hundred thirty million, twenty-one thousand, one hundred eleven".