2021172079 has 2 divisors, whose sum is σ = 2021172080. Its totient is φ = 2021172078.

The previous prime is 2021172071. The next prime is 2021172151. The reversal of 2021172079 is 9702711202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021172079 - 2³ = 2021172071 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021172079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021172071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010586039 + 1010586040.

It is an arithmetic number, because the mean of its divisors is an integer number (1010586040).

Almost surely, 2^2021172079 is an apocalyptic number.

2021172079 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021172079 is an equidigital number, since it uses as much as digits as its factorization.

2021172079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 2021172079 is about 44957.4474253154. The cubic root of 2021172079 is about 1264.3513115029.

The spelling of 2021172079 in words is "two billion, twenty-one million, one hundred seventy-two thousand, seventy-nine".