789111021012121 has 4 divisors (see below), whose sum is σ = 789320835166644. Its totient is φ = 788901206857600.

The previous prime is 789111021012113. The next prime is 789111021012133. The reversal of 789111021012121 is 121210120111987.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 151820939406096 + 637290081606025 = 12321564^2 + 25244605^2 .

It is a cyclic number.

It is not a de Polignac number, because 789111021012121 - 2³ = 789111021012113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (789111021012151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104907071620 + ... + 104907079141.

It is an arithmetic number, because the mean of its divisors is an integer number (197330208791661).

Almost surely, 2^{789111021012121} is an apocalyptic number.

It is an amenable number.

789111021012121 is a deficient number, since it is larger than the sum of its proper divisors (209814154523).

789111021012121 is a wasteful number, since it uses less digits than its factorization.

789111021012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209814154522.

The product of its (nonzero) digits is 4032, while the sum is 37.

The spelling of 789111021012121 in words is "seven hundred eighty-nine trillion, one hundred eleven billion, twenty-one million, twelve thousand, one hundred twenty-one".