21112000199879 has 2 divisors, whose sum is σ = 21112000199880. Its totient is φ = 21112000199878.

The previous prime is 21112000199827. The next prime is 21112000199891. The reversal of 21112000199879 is 97899100021112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112000199879 - 2²⁰ = 21111999151303 is a prime.

It is a super-2 number, since 2×21112000199879² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112000199179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556000099939 + 10556000099940.

It is an arithmetic number, because the mean of its divisors is an integer number (10556000099940).

Almost surely, 2^{21112000199879} is an apocalyptic number.

21112000199879 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112000199879 is an equidigital number, since it uses as much as digits as its factorization.

21112000199879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 50.

The spelling of 21112000199879 in words is "twenty-one trillion, one hundred twelve billion, one hundred ninety-nine thousand, eight hundred seventy-nine".