2111121231 has 8 divisors (see below), whose sum is σ = 2874718464. Its totient is φ = 1377469080.

The previous prime is 2111121209. The next prime is 2111121239. The reversal of 2111121231 is 1321211112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2111121231 is a prime.

It is a super-2 number, since 2×2111121231² = 8913665703957910722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2111121231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111121239) 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, 7486105 + ... + 7486386.

It is an arithmetic number, because the mean of its divisors is an integer number (359339808).

Almost surely, 2^2111121231 is an apocalyptic number.

2111121231 is a deficient number, since it is larger than the sum of its proper divisors (763597233).

2111121231 is a wasteful number, since it uses less digits than its factorization.

2111121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14972541.

The product of its digits is 24, while the sum is 15.

The square root of 2111121231 is about 45946.9392995877. The cubic root of 2111121231 is about 1282.8357602331.

Adding to 2111121231 its reverse (1321211112), we get a palindrome (3432332343).

The spelling of 2111121231 in words is "two billion, one hundred eleven million, one hundred twenty-one thousand, two hundred thirty-one".