9012121220100 has 72 divisors (see below), whose sum is σ = 26117332321248. Its totient is φ = 2399337248000.

The previous prime is 9012121220099. The next prime is 9012121220209. The reversal of 9012121220100 is 10221212109.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24158826 + ... + 24529025.

It is an arithmetic number, because the mean of its divisors is an integer number (362740726684).

Almost surely, 2^{9012121220100} is an apocalyptic number.

It is an amenable number.

9012121220100 is an abundant number, since it is smaller than the sum of its proper divisors (17105211101148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9012121220100 is a wasteful number, since it uses less digits than its factorization.

9012121220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48688485 (or 48688478 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 9012121220100 its reverse (10221212109), we get a palindrome (9022342432209).

The spelling of 9012121220100 in words is "nine trillion, twelve billion, one hundred twenty-one million, two hundred twenty thousand, one hundred".