9012120121 has 4 divisors (see below), whose sum is σ = 9542244852. Its totient is φ = 8481995392.

The previous prime is 9012120067. The next prime is 9012120151. The reversal of 9012120121 is 1210212109.

It is a happy number.

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 4117018896 + 4895101225 = 64164^2 + 69965^2 .

It is a cyclic number.

It is not a de Polignac number, because 9012120121 - 2¹³ = 9012111929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9012120151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265062340 + ... + 265062373.

It is an arithmetic number, because the mean of its divisors is an integer number (2385561213).

Almost surely, 2^9012120121 is an apocalyptic number.

It is an amenable number.

9012120121 is a deficient number, since it is larger than the sum of its proper divisors (530124731).

9012120121 is a wasteful number, since it uses less digits than its factorization.

9012120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530124730.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 9012120121 is about 94932.1869599558. The cubic root of 9012120121 is about 2081.0171400554.

The spelling of 9012120121 in words is "nine billion, twelve million, one hundred twenty thousand, one hundred twenty-one".