2101111994 has 16 divisors (see below), whose sum is σ = 3230044776. Its totient is φ = 1024454400.

The previous prime is 2101111993. The next prime is 2101112023. The reversal of 2101111994 is 4991111012.

It can be written as a sum of positive squares in 4 ways, for example, as 1361979025 + 739132969 = 36905^2 + 27187^2 .

It is a super-2 number, since 2×2101111994² = 8829343222661312072, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2101111993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224774 + ... + 233934.

Almost surely, 2^2101111994 is an apocalyptic number.

2101111994 is a deficient number, since it is larger than the sum of its proper divisors (1128932782).

2101111994 is a wasteful number, since it uses less digits than its factorization.

2101111994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12001.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 2101111994 is about 45837.8881930658. Note that the first 3 decimals coincide. The cubic root of 2101111994 is about 1280.8051562695.

The spelling of 2101111994 in words is "two billion, one hundred one million, one hundred eleven thousand, nine hundred ninety-four".