1221044313 has 8 divisors (see below), whose sum is σ = 1628499168. Its totient is φ = 813809504.

The previous prime is 1221044273. The next prime is 1221044323. The reversal of 1221044313 is 3134401221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221044313 - 2¹⁷ = 1220913241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221044313.

It is not an unprimeable number, because it can be changed into a prime (1221044323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41595 + ... + 64592.

It is an arithmetic number, because the mean of its divisors is an integer number (203562396).

Almost surely, 2^1221044313 is an apocalyptic number.

It is an amenable number.

1221044313 is a deficient number, since it is larger than the sum of its proper divisors (407454855).

1221044313 is a wasteful number, since it uses less digits than its factorization.

1221044313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110023.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1221044313 is about 34943.4444924939. Note that the first 4 decimals coincide. The cubic root of 1221044313 is about 1068.8345283030.

Adding to 1221044313 its reverse (3134401221), we get a palindrome (4355445534).

The spelling of 1221044313 in words is "one billion, two hundred twenty-one million, forty-four thousand, three hundred thirteen".