1229808221 has 4 divisors (see below), whose sum is σ = 1230031200. Its totient is φ = 1229585244.

The previous prime is 1229808211. The next prime is 1229808241. The reversal of 1229808221 is 1228089221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1229808221 - 2¹⁰ = 1229807197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229808211) 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, 103001 + ... + 114318.

It is an arithmetic number, because the mean of its divisors is an integer number (307507800).

Almost surely, 2^1229808221 is an apocalyptic number.

It is an amenable number.

1229808221 is a deficient number, since it is larger than the sum of its proper divisors (222979).

1229808221 is an equidigital number, since it uses as much as digits as its factorization.

1229808221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222978.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 1229808221 is about 35068.6216010838. The cubic root of 1229808221 is about 1071.3855811771.

The spelling of 1229808221 in words is "one billion, two hundred twenty-nine million, eight hundred eight thousand, two hundred twenty-one".