7802120020121 has 16 divisors (see below), whose sum is σ = 9017531550720. Its totient is φ = 6611924816640.

The previous prime is 7802120020117. The next prime is 7802120020139. The reversal of 7802120020121 is 1210200212087.

It is a cyclic number.

It is not a de Polignac number, because 7802120020121 - 2² = 7802120020117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7802120020111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8556605 + ... + 9424421.

It is an arithmetic number, because the mean of its divisors is an integer number (563595721920).

Almost surely, 2^{7802120020121} is an apocalyptic number.

It is an amenable number.

7802120020121 is a deficient number, since it is larger than the sum of its proper divisors (1215411530599).

7802120020121 is a wasteful number, since it uses less digits than its factorization.

7802120020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882344.

The product of its (nonzero) digits is 896, while the sum is 26.

The spelling of 7802120020121 in words is "seven trillion, eight hundred two billion, one hundred twenty million, twenty thousand, one hundred twenty-one".