1220100110221 has 4 divisors (see below), whose sum is σ = 1220263080192. Its totient is φ = 1219937140252.

The previous prime is 1220100110213. The next prime is 1220100110233. The reversal of 1220100110221 is 1220110010221.

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 1220100110221 - 2³ = 1220100110213 is a prime.

It is a super-2 number, since 2×1220100110221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220100110321) 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 3 ways as a sum of consecutive naturals, for example, 81473755 + ... + 81488728.

It is an arithmetic number, because the mean of its divisors is an integer number (305065770048).

Almost surely, 2^{1220100110221} is an apocalyptic number.

It is an amenable number.

1220100110221 is a deficient number, since it is larger than the sum of its proper divisors (162969971).

1220100110221 is an equidigital number, since it uses as much as digits as its factorization.

1220100110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162969970.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1220100110221 its reverse (1220110010221), we get a palindrome (2440210120442).

The spelling of 1220100110221 in words is "one trillion, two hundred twenty billion, one hundred million, one hundred ten thousand, two hundred twenty-one".