2111251231 has 2 divisors, whose sum is σ = 2111251232. Its totient is φ = 2111251230.

The previous prime is 2111251229. The next prime is 2111251273. The reversal of 2111251231 is 1321521112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2111251231 - 2¹ = 2111251229 is a prime.

It is a super-2 number, since 2×2111251231² = 8914763520798030722, which contains 22 as substring.

Together with 2111251229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2111251199 and 2111251208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111251201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055625615 + 1055625616.

It is an arithmetic number, because the mean of its divisors is an integer number (1055625616).

Almost surely, 2^2111251231 is an apocalyptic number.

2111251231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111251231 is an equidigital number, since it uses as much as digits as its factorization.

2111251231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 19.

The square root of 2111251231 is about 45948.3539531070. The cubic root of 2111251231 is about 1282.8620914583.

Adding to 2111251231 its reverse (1321521112), we get a palindrome (3432772343).

The spelling of 2111251231 in words is "two billion, one hundred eleven million, two hundred fifty-one thousand, two hundred thirty-one".