111031120031021 has 2 divisors, whose sum is σ = 111031120031022. Its totient is φ = 111031120031020.

The previous prime is 111031120030991. The next prime is 111031120031047. The reversal of 111031120031021 is 120130021130111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73400428434025 + 37630691596996 = 8567405^2 + 6134386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111031120031021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111031120030021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55515560015510 + 55515560015511.

It is an arithmetic number, because the mean of its divisors is an integer number (55515560015511).

Almost surely, 2^{111031120031021} is an apocalyptic number.

It is an amenable number.

111031120031021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111031120031021 is an equidigital number, since it uses as much as digits as its factorization.

111031120031021 is an evil number, because the sum of its binary digits is even.

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

Adding to 111031120031021 its reverse (120130021130111), we get a palindrome (231161141161132).

The spelling of 111031120031021 in words is "one hundred eleven trillion, thirty-one billion, one hundred twenty million, thirty-one thousand, twenty-one".