2221221201121 has 4 divisors (see below), whose sum is σ = 2392084370452. Its totient is φ = 2050358031792.

The previous prime is 2221221201119. The next prime is 2221221201131. The reversal of 2221221201121 is 1211021221222.

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 1237791978721 + 983429222400 = 1112561^2 + 991680^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221221201121 - 2¹ = 2221221201119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221221201131) 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, 85431584646 + ... + 85431584671.

It is an arithmetic number, because the mean of its divisors is an integer number (598021092613).

Almost surely, 2^{2221221201121} is an apocalyptic number.

It is an amenable number.

2221221201121 is a deficient number, since it is larger than the sum of its proper divisors (170863169331).

2221221201121 is a wasteful number, since it uses less digits than its factorization.

2221221201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170863169330.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2221221201121 its reverse (1211021221222), we get a palindrome (3432242422343).

The spelling of 2221221201121 in words is "two trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, one hundred twenty-one".