1221266912 has 12 divisors (see below), whose sum is σ = 2404369296. Its totient is φ = 610633440.

The previous prime is 1221266899. The next prime is 1221266923. The reversal of 1221266912 is 2196621221.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 38164591 = 1221266912 / (1 + 2 + 2 + 1 + 2 + 6 + 6 + 9 + 1 + 2).

It is a congruent number.

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 as a sum of consecutive naturals, namely, 19082264 + ... + 19082327.

It is an arithmetic number, because the mean of its divisors is an integer number (200364108).

Almost surely, 2^1221266912 is an apocalyptic number.

It is an amenable number.

1221266912 is a deficient number, since it is larger than the sum of its proper divisors (1183102384).

1221266912 is an equidigital number, since it uses as much as digits as its factorization.

1221266912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38164601 (or 38164593 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 1221266912 is about 34946.6294798225. The cubic root of 1221266912 is about 1068.8994746330.

The spelling of 1221266912 in words is "one billion, two hundred twenty-one million, two hundred sixty-six thousand, nine hundred twelve".