1220201102221 has 8 divisors (see below), whose sum is σ = 1222426968120. Its totient is φ = 1217975523072.

The previous prime is 1220201102209. The next prime is 1220201102231. The reversal of 1220201102221 is 1222011020221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 196239254121 + 1023961848100 = 442989^2 + 1011910^2 .

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 1220201102221 - 2⁵ = 1220201102189 is a prime.

It is a super-2 number, since 2×1220201102221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220201102195 and 1220201102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220201102201) 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, 9640281 + ... + 9766033.

It is an arithmetic number, because the mean of its divisors is an integer number (152803371015).

Almost surely, 2^{1220201102221} is an apocalyptic number.

It is an amenable number.

1220201102221 is a deficient number, since it is larger than the sum of its proper divisors (2225865899).

1220201102221 is a wasteful number, since it uses less digits than its factorization.

1220201102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143375.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1220201102221 its reverse (1222011020221), we get a palindrome (2442212122442).

The spelling of 1220201102221 in words is "one trillion, two hundred twenty billion, two hundred one million, one hundred two thousand, two hundred twenty-one".