9001220122121 has 4 divisors (see below), whose sum is σ = 9035445293952. Its totient is φ = 8966994950292.

The previous prime is 9001220122079. The next prime is 9001220122123. The reversal of 9001220122121 is 1212210221009.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9001220122121 - 2¹⁰ = 9001220121097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9001220122123) 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, 17112585521 + ... + 17112586046.

It is an arithmetic number, because the mean of its divisors is an integer number (2258861323488).

Almost surely, 2^{9001220122121} is an apocalyptic number.

It is an amenable number.

9001220122121 is a deficient number, since it is larger than the sum of its proper divisors (34225171831).

9001220122121 is a wasteful number, since it uses less digits than its factorization.

9001220122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34225171830.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 9001220122121 in words is "nine trillion, one billion, two hundred twenty million, one hundred twenty-two thousand, one hundred twenty-one".