9101200021121 has 4 divisors (see below), whose sum is σ = 9801292330452. Its totient is φ = 8401107711792.

The previous prime is 9101200021021. The next prime is 9101200021129. The reversal of 9101200021121 is 1211200021019.

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 5292024193600 + 3809175827521 = 2300440^2 + 1951711^2 .

It is a cyclic number.

It is not a de Polignac number, because 9101200021121 - 2¹⁰ = 9101200020097 is a prime.

It is a super-4 number, since 4×9101200021121⁴ (a number of 53 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9101200021093 and 9101200021102.

It is not an unprimeable number, because it can be changed into a prime (9101200021129) 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, 350046154646 + ... + 350046154671.

It is an arithmetic number, because the mean of its divisors is an integer number (2450323082613).

Almost surely, 2^{9101200021121} is an apocalyptic number.

It is an amenable number.

9101200021121 is a deficient number, since it is larger than the sum of its proper divisors (700092309331).

9101200021121 is a wasteful number, since it uses less digits than its factorization.

9101200021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700092309330.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 9101200021121 in words is "nine trillion, one hundred one billion, two hundred million, twenty-one thousand, one hundred twenty-one".