1217341220 has 24 divisors (see below), whose sum is σ = 2557498104. Its totient is φ = 486730496.

The previous prime is 1217341189. The next prime is 1217341261. The reversal of 1217341220 is 221437121.

It can be written as a sum of positive squares in 4 ways, for example, as 69622336 + 1147718884 = 8344^2 + 33878^2 .

It is a super-2 number, since 2×1217341220² = 2963839291822176800, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 41102 + ... + 64218.

It is an arithmetic number, because the mean of its divisors is an integer number (106562421).

Almost surely, 2^1217341220 is an apocalyptic number.

1217341220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217341220 is an abundant number, since it is smaller than the sum of its proper divisors (1340156884).

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

1217341220 is a wasteful number, since it uses less digits than its factorization.

1217341220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25759 (or 25757 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1217341220 is about 34890.4173090549. The cubic root of 1217341220 is about 1067.7529400420.

Adding to 1217341220 its reverse (221437121), we get a palindrome (1438778341).

The spelling of 1217341220 in words is "one billion, two hundred seventeen million, three hundred forty-one thousand, two hundred twenty".