1221109458 has 8 divisors (see below), whose sum is σ = 2442218928. Its totient is φ = 407036484.

The previous prime is 1221109457. The next prime is 1221109523. The reversal of 1221109458 is 8549011221.

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

1221109458 is an admirable number.

It is a super-2 number, since 2×1221109458² = 2982216616834107528, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1221109457) 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 in 3 ways as a sum of consecutive naturals, for example, 101759116 + ... + 101759127.

It is an arithmetic number, because the mean of its divisors is an integer number (305277366).

Almost surely, 2^1221109458 is an apocalyptic number.

1221109458 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221109458 is a wasteful number, since it uses less digits than its factorization.

1221109458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203518248.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 1221109458 is about 34944.3766291516. The cubic root of 1221109458 is about 1068.8535360726.

The spelling of 1221109458 in words is "one billion, two hundred twenty-one million, one hundred nine thousand, four hundred fifty-eight".