2201202121121 has 4 divisors (see below), whose sum is σ = 2330684598852. Its totient is φ = 2071719643392.

The previous prime is 2201202121117. The next prime is 2201202121229. The reversal of 2201202121121 is 1211212021022.

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 1139139963025 + 1062062158096 = 1067305^2 + 1030564^2 .

It is not a de Polignac number, because 2201202121121 - 2² = 2201202121117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 129482477713 = 2201202121121 / (2 + 2 + 0 + 1 + 2 + 0 + 2 + 1 + 2 + 1 + 1 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2201202121121.

It is not an unprimeable number, because it can be changed into a prime (2201202126121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64741238840 + ... + 64741238873.

It is an arithmetic number, because the mean of its divisors is an integer number (582671149713).

Almost surely, 2^{2201202121121} is an apocalyptic number.

It is an amenable number.

2201202121121 is a deficient number, since it is larger than the sum of its proper divisors (129482477731).

2201202121121 is a wasteful number, since it uses less digits than its factorization.

2201202121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129482477730.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2201202121121 its reverse (1211212021022), we get a palindrome (3412414142143).

The spelling of 2201202121121 in words is "two trillion, two hundred one billion, two hundred two million, one hundred twenty-one thousand, one hundred twenty-one".