1201221210221 has 4 divisors (see below), whose sum is σ = 1264443379200. Its totient is φ = 1137999041244.

The previous prime is 1201221210149. The next prime is 1201221210223. The reversal of 1201221210221 is 1220121221021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201221210221 - 2¹⁸ = 1201220948077 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 1201221210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201221210223) 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, 31611084461 + ... + 31611084498.

It is an arithmetic number, because the mean of its divisors is an integer number (316110844800).

Almost surely, 2^{1201221210221} is an apocalyptic number.

It is an amenable number.

1201221210221 is a deficient number, since it is larger than the sum of its proper divisors (63222168979).

1201221210221 is an equidigital number, since it uses as much as digits as its factorization.

1201221210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63222168978.

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

Adding to 1201221210221 its reverse (1220121221021), we get a palindrome (2421342431242).

The spelling of 1201221210221 in words is "one trillion, two hundred one billion, two hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".