1222212109 has 4 divisors (see below), whose sum is σ = 1223687260. Its totient is φ = 1220736960.

The previous prime is 1222212097. The next prime is 1222212113. The reversal of 1222212109 is 9012122221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9012122221 = 19429 ⋅463849.

It can be written as a sum of positive squares in 2 ways, for example, as 523402884 + 698809225 = 22878^2 + 26435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222212109 - 2⁵ = 1222212077 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 1222212109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222212119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 736332 + ... + 737989.

It is an arithmetic number, because the mean of its divisors is an integer number (305921815).

Almost surely, 2^1222212109 is an apocalyptic number.

It is an amenable number.

1222212109 is a deficient number, since it is larger than the sum of its proper divisors (1475151).

1222212109 is an equidigital number, since it uses as much as digits as its factorization.

1222212109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475150.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1222212109 is about 34960.1503000202. The cubic root of 1222212109 is about 1069.1751610353.

The spelling of 1222212109 in words is "one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred nine".