1221104605 has 16 divisors (see below), whose sum is σ = 1679955840. Its totient is φ = 834679872.

The previous prime is 1221104567. The next prime is 1221104623. The reversal of 1221104605 is 5064011221.

It is a cyclic number.

It is not a de Polignac number, because 1221104605 - 2²⁵ = 1187550173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43935 + ... + 66124.

It is an arithmetic number, because the mean of its divisors is an integer number (104997240).

Almost surely, 2^1221104605 is an apocalyptic number.

It is an amenable number.

1221104605 is a deficient number, since it is larger than the sum of its proper divisors (458851235).

1221104605 is a wasteful number, since it uses less digits than its factorization.

1221104605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110388.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1221104605 is about 34944.3071901562. The cubic root of 1221104605 is about 1068.8521201053.

Adding to 1221104605 its reverse (5064011221), we get a palindrome (6285115826).

The spelling of 1221104605 in words is "one billion, two hundred twenty-one million, one hundred four thousand, six hundred five".