790002121021 has 4 divisors (see below), whose sum is σ = 817243573500. Its totient is φ = 762760668544.

The previous prime is 790002121003. The next prime is 790002121033. The reversal of 790002121021 is 120121200097.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120121200097 = 137 ⋅876797081.

It can be written as a sum of positive squares in 2 ways, for example, as 541585605625 + 248416515396 = 735925^2 + 498414^2 .

It is a cyclic number.

It is not a de Polignac number, because 790002121021 - 2¹³ = 790002112829 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 (790002121001) 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, 13620726196 + ... + 13620726253.

It is an arithmetic number, because the mean of its divisors is an integer number (204310893375).

Almost surely, 2^790002121021 is an apocalyptic number.

It is an amenable number.

790002121021 is a deficient number, since it is larger than the sum of its proper divisors (27241452479).

790002121021 is a wasteful number, since it uses less digits than its factorization.

790002121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27241452478.

The product of its (nonzero) digits is 504, while the sum is 25.

The spelling of 790002121021 in words is "seven hundred ninety billion, two million, one hundred twenty-one thousand, twenty-one".