789020221021 has 2 divisors, whose sum is σ = 789020221022. Its totient is φ = 789020221020.

The previous prime is 789020220979. The next prime is 789020221049. The reversal of 789020221021 is 120122020987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 776945288025 + 12074932996 = 881445^2 + 109886^2 .

It is an emirp because it is prime and its reverse (120122020987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 789020221021 - 2²¹ = 789018123869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (789020221061) 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, 394510110510 + 394510110511.

It is an arithmetic number, because the mean of its divisors is an integer number (394510110511).

Almost surely, 2^789020221021 is an apocalyptic number.

It is an amenable number.

789020221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

789020221021 is an equidigital number, since it uses as much as digits as its factorization.

789020221021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 789020221021 in words is "seven hundred eighty-nine billion, twenty million, two hundred twenty-one thousand, twenty-one".