21000112012079 has 2 divisors, whose sum is σ = 21000112012080. Its totient is φ = 21000112012078.

The previous prime is 21000112012057. The next prime is 21000112012129. The reversal of 21000112012079 is 97021021100012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000112012079 is a prime.

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 (21000112012379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500056006039 + 10500056006040.

It is an arithmetic number, because the mean of its divisors is an integer number (10500056006040).

Almost surely, 2^{21000112012079} is an apocalyptic number.

21000112012079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000112012079 is an equidigital number, since it uses as much as digits as its factorization.

21000112012079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 26.

The spelling of 21000112012079 in words is "twenty-one trillion, one hundred twelve million, twelve thousand, seventy-nine".