1220202211221 has 24 divisors (see below), whose sum is σ = 2014904234304. Its totient is φ = 697049962560.

The previous prime is 1220202211093. The next prime is 1220202211231. The reversal of 1220202211221 is 1221122020221.

It is a happy number.

1220202211221 is a `hidden beast` number, since 1 + 220 + 2 + 0 + 221 + 1 + 221 = 666.

It is not a de Polignac number, because 1220202211221 - 2⁷ = 1220202211093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220202211194 and 1220202211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220202211231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2682520 + ... + 3104241.

It is an arithmetic number, because the mean of its divisors is an integer number (83954343096).

Almost surely, 2^{1220202211221} is an apocalyptic number.

It is an amenable number.

1220202211221 is a deficient number, since it is larger than the sum of its proper divisors (794702023083).

1220202211221 is a wasteful number, since it uses less digits than its factorization.

1220202211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5790121 (or 5790118 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1220202211221 its reverse (1221122020221), we get a palindrome (2441324231442).

It can be divided in two parts, 122020221 and 1221, that multiplied together give a palindrome (148986689841).

The spelling of 1220202211221 in words is "one trillion, two hundred twenty billion, two hundred two million, two hundred eleven thousand, two hundred twenty-one".