7120121065021 has 4 divisors (see below), whose sum is σ = 7120163717212. Its totient is φ = 7120078412832.

The previous prime is 7120121064997. The next prime is 7120121065037. The reversal of 7120121065021 is 1205601210217.

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 2686616028100 + 4433505036921 = 1639090^2 + 2105589^2 .

It is a cyclic number.

It is not a de Polignac number, because 7120121065021 - 2⁷ = 7120121064893 is a prime.

It is a super-2 number, since 2×7120121065021² (a number of 27 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 (7120121065051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21074706 + ... + 21409891.

It is an arithmetic number, because the mean of its divisors is an integer number (1780040929303).

Almost surely, 2^{7120121065021} is an apocalyptic number.

It is an amenable number.

7120121065021 is a deficient number, since it is larger than the sum of its proper divisors (42652191).

7120121065021 is a wasteful number, since it uses less digits than its factorization.

7120121065021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42652190.

The product of its (nonzero) digits is 1680, while the sum is 28.

Adding to 7120121065021 its reverse (1205601210217), we get a palindrome (8325722275238).

The spelling of 7120121065021 in words is "seven trillion, one hundred twenty billion, one hundred twenty-one million, sixty-five thousand, twenty-one".