2111891121 has 48 divisors (see below), whose sum is σ = 3211253760. Its totient is φ = 1336214880.

The previous prime is 2111891101. The next prime is 2111891129. The reversal of 2111891121 is 1211981112.

It is not a de Polignac number, because 2111891121 - 2²² = 2107696817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2111891129) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2047876 + ... + 2048906.

It is an arithmetic number, because the mean of its divisors is an integer number (66901120).

Almost surely, 2^2111891121 is an apocalyptic number.

It is an amenable number.

2111891121 is a deficient number, since it is larger than the sum of its proper divisors (1099362639).

2111891121 is a wasteful number, since it uses less digits than its factorization.

2111891121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226 (or 1223 counting only the distinct ones).

The product of its digits is 288, while the sum is 27.

The square root of 2111891121 is about 45955.3165694678. The cubic root of 2111891121 is about 1282.9916840733.

The spelling of 2111891121 in words is "two billion, one hundred eleven million, eight hundred ninety-one thousand, one hundred twenty-one".