9121021120 has 56 divisors (see below), whose sum is σ = 21816998784. Its totient is φ = 3632019456.

The previous prime is 9121021111. The next prime is 9121021127. The reversal of 9121021120 is 211201219.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (9121021127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7452 + ... + 135268.

It is an arithmetic number, because the mean of its divisors is an integer number (389589264).

Almost surely, 2^9121021120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9121021120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10908499392).

9121021120 is an abundant number, since it is smaller than the sum of its proper divisors (12695977664).

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

9121021120 is a wasteful number, since it uses less digits than its factorization.

9121021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128057 (or 128047 counting only the distinct ones).

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

The square root of 9121021120 is about 95504.0371921522. The cubic root of 9121021120 is about 2089.3658263784.

Adding to 9121021120 its reverse (211201219), we get a palindrome (9332222339).

The spelling of 9121021120 in words is "nine billion, one hundred twenty-one million, twenty-one thousand, one hundred twenty".