221021020079 has 2 divisors, whose sum is σ = 221021020080. Its totient is φ = 221021020078.

The previous prime is 221021020069. The next prime is 221021020081. The reversal of 221021020079 is 970020120122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221021020079 - 2²⁸ = 220752584623 is a prime.

Together with 221021020081, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221021020009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510510039 + 110510510040.

It is an arithmetic number, because the mean of its divisors is an integer number (110510510040).

Almost surely, 2^221021020079 is an apocalyptic number.

221021020079 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021020079 is an equidigital number, since it uses as much as digits as its factorization.

221021020079 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 26.

The spelling of 221021020079 in words is "two hundred twenty-one billion, twenty-one million, twenty thousand, seventy-nine".