1221994267 has 4 divisors (see below), whose sum is σ = 1315993840. Its totient is φ = 1127994696.

The previous prime is 1221994261. The next prime is 1221994303. The reversal of 1221994267 is 7624991221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221994267 - 2²⁷ = 1087776539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221994261) 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, 46999767 + ... + 46999792.

It is an arithmetic number, because the mean of its divisors is an integer number (328998460).

Almost surely, 2^1221994267 is an apocalyptic number.

1221994267 is a deficient number, since it is larger than the sum of its proper divisors (93999573).

1221994267 is an equidigital number, since it uses as much as digits as its factorization.

1221994267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93999572.

The product of its digits is 108864, while the sum is 43.

The square root of 1221994267 is about 34957.0345853306. The cubic root of 1221994267 is about 1069.1116354838. Note that the first 3 decimals are identical.

The spelling of 1221994267 in words is "one billion, two hundred twenty-one million, nine hundred ninety-four thousand, two hundred sixty-seven".