1220001222221 has 8 divisors (see below), whose sum is σ = 1252634016480. Its totient is φ = 1187562094992.

The previous prime is 1220001222197. The next prime is 1220001222337. The reversal of 1220001222221 is 1222221000221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1220001222221 - 2³⁴ = 1202821353037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220001222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220001222421) 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, 48403991 + ... + 48429188.

It is an arithmetic number, because the mean of its divisors is an integer number (156579252060).

Almost surely, 2^{1220001222221} is an apocalyptic number.

It is an amenable number.

1220001222221 is a deficient number, since it is larger than the sum of its proper divisors (32632794259).

1220001222221 is an equidigital number, since it uses as much as digits as its factorization.

1220001222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96833515.

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

Adding to 1220001222221 its reverse (1222221000221), we get a palindrome (2442222222442).

The spelling of 1220001222221 in words is "one trillion, two hundred twenty billion, one million, two hundred twenty-two thousand, two hundred twenty-one".