1220120202221 has 8 divisors (see below), whose sum is σ = 1224589084824. Its totient is φ = 1215651781440.

The previous prime is 1220120202187. The next prime is 1220120202253. The reversal of 1220120202221 is 1222020210221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5793340996 + 1214326861225 = 76114^2 + 1101965^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220120202221 - 2⁶ = 1220120202157 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 1220120202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220120292221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5715791 + ... + 5925411.

It is an arithmetic number, because the mean of its divisors is an integer number (153073635603).

Almost surely, 2^{1220120202221} is an apocalyptic number.

It is an amenable number.

1220120202221 is a deficient number, since it is larger than the sum of its proper divisors (4468882603).

1220120202221 is a wasteful number, since it uses less digits than its factorization.

1220120202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230911.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1220120202221 its reverse (1222020210221), we get a palindrome (2442140412442).

The spelling of 1220120202221 in words is "one trillion, two hundred twenty billion, one hundred twenty million, two hundred two thousand, two hundred twenty-one".