1220100211221 has 32 divisors (see below), whose sum is σ = 1655451813120. Its totient is φ = 799209068544.

The previous prime is 1220100211181. The next prime is 1220100211241. The reversal of 1220100211221 is 1221120010221.

It is not a de Polignac number, because 1220100211221 - 2⁶ = 1220100211157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220100211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220100211241) 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 31 ways as a sum of consecutive naturals, for example, 35676096 + ... + 35710278.

It is an arithmetic number, because the mean of its divisors is an integer number (51732869160).

Almost surely, 2^{1220100211221} is an apocalyptic number.

It is an amenable number.

1220100211221 is a deficient number, since it is larger than the sum of its proper divisors (435351601899).

1220100211221 is a wasteful number, since it uses less digits than its factorization.

1220100211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35165.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1220100211221 its reverse (1221120010221), we get a palindrome (2441220221442).

The spelling of 1220100211221 in words is "one trillion, two hundred twenty billion, one hundred million, two hundred eleven thousand, two hundred twenty-one".