2031111121 has 8 divisors (see below), whose sum is σ = 2200295720. Its totient is φ = 1874869776.

The previous prime is 2031111107. The next prime is 2031111139. The reversal of 2031111121 is 1211111302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 549246096 + 1481865025 = 23436^2 + 38495^2 .

It is not a de Polignac number, because 2031111121 - 2²¹ = 2029013969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2031111161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460050 + ... + 464443.

It is an arithmetic number, because the mean of its divisors is an integer number (275036965).

Almost surely, 2^2031111121 is an apocalyptic number.

It is an amenable number.

2031111121 is a deficient number, since it is larger than the sum of its proper divisors (169184599).

2031111121 is an frugal number, since it uses more digits than its factorization.

2031111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924532 (or 924506 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 2031111121 is about 45067.8501927926. The cubic root of 2031111121 is about 1266.4203912323.

Adding to 2031111121 its reverse (1211111302), we get a palindrome (3242222423).

The spelling of 2031111121 in words is "two billion, thirty-one million, one hundred eleven thousand, one hundred twenty-one".