1221146613 has 12 divisors (see below), whose sum is σ = 1840569120. Its totient is φ = 778702056.

The previous prime is 1221146593. The next prime is 1221146629. The reversal of 1221146613 is 3166411221.

It is a happy number.

1221146613 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 1 + 46 + 613 = 666.

It is not a de Polignac number, because 1221146613 - 2⁵ = 1221146581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221146683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2949423 + ... + 2949836.

It is an arithmetic number, because the mean of its divisors is an integer number (153380760).

Almost surely, 2^1221146613 is an apocalyptic number.

It is an amenable number.

1221146613 is a deficient number, since it is larger than the sum of its proper divisors (619422507).

1221146613 is a wasteful number, since it uses less digits than its factorization.

1221146613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5899288 (or 5899285 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1221146613 is about 34944.9082557102. The cubic root of 1221146613 is about 1068.8643767198.

Adding to 1221146613 its reverse (3166411221), we get a palindrome (4387557834).

The spelling of 1221146613 in words is "one billion, two hundred twenty-one million, one hundred forty-six thousand, six hundred thirteen".