2101111879 has 2 divisors, whose sum is σ = 2101111880. Its totient is φ = 2101111878.

The previous prime is 2101111867. The next prime is 2101111897. The reversal of 2101111879 is 9781111012.

It is a happy number.

Together with next prime (2101111897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2101111879 - 2⁹ = 2101111367 is a prime.

It is a super-2 number, since 2×2101111879² = 8829342256149821282, 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 2101111879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101111079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050555939 + 1050555940.

It is an arithmetic number, because the mean of its divisors is an integer number (1050555940).

Almost surely, 2^2101111879 is an apocalyptic number.

2101111879 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101111879 is an equidigital number, since it uses as much as digits as its factorization.

2101111879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 31.

The square root of 2101111879 is about 45837.8869386450. The cubic root of 2101111879 is about 1280.8051329021.

The spelling of 2101111879 in words is "two billion, one hundred one million, one hundred eleven thousand, eight hundred seventy-nine".