879021121021 has 16 divisors (see below), whose sum is σ = 903829425408. Its totient is φ = 854485696000.

The previous prime is 879021121019. The next prime is 879021121049. The reversal of 879021121021 is 120121120978.

It is a cyclic number.

It is not a de Polignac number, because 879021121021 - 2¹ = 879021121019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (879021121081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4291266 + ... + 4491436.

It is an arithmetic number, because the mean of its divisors is an integer number (56489339088).

Almost surely, 2^879021121021 is an apocalyptic number.

It is an amenable number.

879021121021 is a deficient number, since it is larger than the sum of its proper divisors (24808304387).

879021121021 is a wasteful number, since it uses less digits than its factorization.

879021121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200852.

The product of its (nonzero) digits is 4032, while the sum is 34.

Adding to 879021121021 its reverse (120121120978), we get a palindrome (999142241999).

The spelling of 879021121021 in words is "eight hundred seventy-nine billion, twenty-one million, one hundred twenty-one thousand, twenty-one".