1222220121 has 8 divisors (see below), whose sum is σ = 1660374720. Its totient is φ = 799439472.

The previous prime is 1222220113. The next prime is 1222220137. The reversal of 1222220121 is 1210222221.

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

It is not a de Polignac number, because 1222220121 - 2³ = 1222220113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1222220121.

It is not an unprimeable number, because it can be changed into a prime (1222220141) 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, 3843301 + ... + 3843618.

It is an arithmetic number, because the mean of its divisors is an integer number (207546840).

Almost surely, 2^1222220121 is an apocalyptic number.

It is an amenable number.

1222220121 is a deficient number, since it is larger than the sum of its proper divisors (438154599).

1222220121 is an equidigital number, since it uses as much as digits as its factorization.

1222220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7686975.

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

The square root of 1222220121 is about 34960.2648874404. The cubic root of 1222220121 is about 1069.1774972944.

Adding to 1222220121 its reverse (1210222221), we get a palindrome (2432442342).

The spelling of 1222220121 in words is "one billion, two hundred twenty-two million, two hundred twenty thousand, one hundred twenty-one".