1221200122 has 8 divisors (see below), whose sum is σ = 1841921172. Its totient is φ = 607226400.

The previous prime is 1221200119. The next prime is 1221200159. The reversal of 1221200122 is 2210021221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1209578841 + 11621281 = 34779^2 + 3409^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1686379 + ... + 1687102.

Almost surely, 2^1221200122 is an apocalyptic number.

1221200122 is a deficient number, since it is larger than the sum of its proper divisors (620721050).

1221200122 is a wasteful number, since it uses less digits than its factorization.

1221200122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373664.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1221200122 is about 34945.6738667321. The cubic root of 1221200122 is about 1068.8799885576.

Adding to 1221200122 its reverse (2210021221), we get a palindrome (3431221343).

The spelling of 1221200122 in words is "one billion, two hundred twenty-one million, two hundred thousand, one hundred twenty-two".