1220220100221 has 16 divisors (see below), whose sum is σ = 1637347310784. Its totient is φ = 808292127104.

The previous prime is 1220220100171. The next prime is 1220220100243. The reversal of 1220220100221 is 1220010220221.

It is a cyclic number.

It is not a de Polignac number, because 1220220100221 - 2¹¹ = 1220220098173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220220100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220220120221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159985 + ... + 1570361.

It is an arithmetic number, because the mean of its divisors is an integer number (102334206924).

Almost surely, 2^{1220220100221} is an apocalyptic number.

It is an amenable number.

1220220100221 is a deficient number, since it is larger than the sum of its proper divisors (417127210563).

1220220100221 is a wasteful number, since it uses less digits than its factorization.

1220220100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412220.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1220220100221 its reverse (1220010220221), we get a palindrome (2440230320442).

The spelling of 1220220100221 in words is "one trillion, two hundred twenty billion, two hundred twenty million, one hundred thousand, two hundred twenty-one".