1221134786 has 16 divisors (see below), whose sum is σ = 1940798880. Its totient is φ = 574251840.

The previous prime is 1221134779. The next prime is 1221134801. The reversal of 1221134786 is 6874311221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40325 + ... + 63783.

It is an arithmetic number, because the mean of its divisors is an integer number (121299930).

Almost surely, 2^1221134786 is an apocalyptic number.

1221134786 is a deficient number, since it is larger than the sum of its proper divisors (719664094).

1221134786 is a wasteful number, since it uses less digits than its factorization.

1221134786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25009.

The product of its digits is 16128, while the sum is 35.

The square root of 1221134786 is about 34944.7390317913. The cubic root of 1221134786 is about 1068.8609260012.

The spelling of 1221134786 in words is "one billion, two hundred twenty-one million, one hundred thirty-four thousand, seven hundred eighty-six".