21110100079 has 2 divisors, whose sum is σ = 21110100080. Its totient is φ = 21110100078.

The previous prime is 21110100073. The next prime is 21110100083. The reversal of 21110100079 is 97000101112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21110100079 - 2¹⁵ = 21110067311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110100073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555050039 + 10555050040.

It is an arithmetic number, because the mean of its divisors is an integer number (10555050040).

Almost surely, 2^21110100079 is an apocalyptic number.

21110100079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110100079 is an equidigital number, since it uses as much as digits as its factorization.

21110100079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 22.

The spelling of 21110100079 in words is "twenty-one billion, one hundred ten million, one hundred thousand, seventy-nine".