121222211081 has 4 divisors (see below), whose sum is σ = 121837552452. Its totient is φ = 120606869712.

The previous prime is 121222211063. The next prime is 121222211101. The reversal of 121222211081 is 180112222121.

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 117964084681 + 3258126400 = 343459^2 + 57080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121222211081 is a prime.

It is a super-3 number, since 3×121222211081³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121222211281) 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, 307670390 + ... + 307670783.

It is an arithmetic number, because the mean of its divisors is an integer number (30459388113).

Almost surely, 2^121222211081 is an apocalyptic number.

It is an amenable number.

121222211081 is a deficient number, since it is larger than the sum of its proper divisors (615341371).

121222211081 is an equidigital number, since it uses as much as digits as its factorization.

121222211081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615341370.

The product of its (nonzero) digits is 256, while the sum is 23.

The spelling of 121222211081 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred eleven thousand, eighty-one".