1222220100221 has 8 divisors (see below), whose sum is σ = 1316049560640. Its totient is φ = 1130827768768.

The previous prime is 1222220100209. The next prime is 1222220100229. The reversal of 1222220100221 is 1220010222221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1222220100221 - 2²⁶ = 1222152991357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1222220100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222220100229) 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, 609281201 + ... + 609283206.

It is an arithmetic number, because the mean of its divisors is an integer number (164506195080).

Almost surely, 2^{1222220100221} is an apocalyptic number.

It is an amenable number.

1222220100221 is a deficient number, since it is larger than the sum of its proper divisors (93829460419).

1222220100221 is a wasteful number, since it uses less digits than its factorization.

1222220100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218564483.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1222220100221 its reverse (1220010222221), we get a palindrome (2442230322442).

The spelling of 1222220100221 in words is "one trillion, two hundred twenty-two billion, two hundred twenty million, one hundred thousand, two hundred twenty-one".