1221650272 has 12 divisors (see below), whose sum is σ = 2405124036. Its totient is φ = 610825120.

The previous prime is 1221650207. The next prime is 1221650279. The reversal of 1221650272 is 2720561221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221650272.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221650279) by changing a digit.

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 as a sum of consecutive naturals, namely, 19088254 + ... + 19088317.

It is an arithmetic number, because the mean of its divisors is an integer number (200427003).

Almost surely, 2^1221650272 is an apocalyptic number.

It is an amenable number.

1221650272 is a deficient number, since it is larger than the sum of its proper divisors (1183473764).

1221650272 is an equidigital number, since it uses as much as digits as its factorization.

1221650272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38176581 (or 38176573 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1221650272 is about 34952.1139847077. The cubic root of 1221650272 is about 1069.0113067066.

The spelling of 1221650272 in words is "one billion, two hundred twenty-one million, six hundred fifty thousand, two hundred seventy-two".