789900001021 has 4 divisors (see below), whose sum is σ = 790343020192. Its totient is φ = 789456981852.

The previous prime is 789900000979. The next prime is 789900001043. The reversal of 789900001021 is 120100009987.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 789900001021 - 2¹³ = 789899992829 is a prime.

It is a super-2 number, since 2×789900001021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (789900401021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221506911 + ... + 221510476.

It is an arithmetic number, because the mean of its divisors is an integer number (197585755048).

Almost surely, 2^789900001021 is an apocalyptic number.

It is an amenable number.

789900001021 is a deficient number, since it is larger than the sum of its proper divisors (443019171).

789900001021 is a wasteful number, since it uses less digits than its factorization.

789900001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443019170.

The product of its (nonzero) digits is 9072, while the sum is 37.

The spelling of 789900001021 in words is "seven hundred eighty-nine billion, nine hundred million, one thousand, twenty-one".