1201121022221 has 4 divisors (see below), whose sum is σ = 1220811530844. Its totient is φ = 1181430513600.

The previous prime is 1201121022203. The next prime is 1201121022251. The reversal of 1201121022221 is 1222201211021.

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 12737605321 + 1188383416900 = 112861^2 + 1090130^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201121022221 - 2¹⁴ = 1201121005837 is a prime.

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 1201121022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201121022251) 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, 9845254220 + ... + 9845254341.

It is an arithmetic number, because the mean of its divisors is an integer number (305202882711).

Almost surely, 2^{1201121022221} is an apocalyptic number.

It is an amenable number.

1201121022221 is a deficient number, since it is larger than the sum of its proper divisors (19690508623).

1201121022221 is an equidigital number, since it uses as much as digits as its factorization.

1201121022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19690508622.

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

Adding to 1201121022221 its reverse (1222201211021), we get a palindrome (2423322233242).

The spelling of 1201121022221 in words is "one trillion, two hundred one billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".