1221244317 has 64 divisors (see below), whose sum is σ = 2068416000. Its totient is φ = 707503104.

The previous prime is 1221244303. The next prime is 1221244369. The reversal of 1221244317 is 7134421221.

1221244317 is a `hidden beast` number, since 1 + 2 + 212 + 443 + 1 + 7 = 666.

It is not a de Polignac number, because 1221244317 - 2⁴ = 1221244301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221244417) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 304159 + ... + 308147.

It is an arithmetic number, because the mean of its divisors is an integer number (32319000).

Almost surely, 2^1221244317 is an apocalyptic number.

1221244317 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1221244317 is a deficient number, since it is larger than the sum of its proper divisors (847171683).

1221244317 is a wasteful number, since it uses less digits than its factorization.

1221244317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4067 (or 4061 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 1221244317 is about 34946.3061996543. The cubic root of 1221244317 is about 1068.8928825898.

Adding to 1221244317 its reverse (7134421221), we get a palindrome (8355665538).

The spelling of 1221244317 in words is "one billion, two hundred twenty-one million, two hundred forty-four thousand, three hundred seventeen".