1221010113 has 32 divisors (see below), whose sum is σ = 1744358400. Its totient is φ = 758016000.

The previous prime is 1221010111. The next prime is 1221010117. The reversal of 1221010113 is 3110101221.

It is not a de Polignac number, because 1221010113 - 2¹ = 1221010111 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221010111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1080933 + ... + 1082061.

It is an arithmetic number, because the mean of its divisors is an integer number (54511200).

Almost surely, 2^1221010113 is an apocalyptic number.

It is an amenable number.

1221010113 is a deficient number, since it is larger than the sum of its proper divisors (523348287).

1221010113 is a wasteful number, since it uses less digits than its factorization.

1221010113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1221010113 is about 34942.9551268922. The cubic root of 1221010113 is about 1068.8245492815.

Adding to 1221010113 its reverse (3110101221), we get a palindrome (4331111334).

The spelling of 1221010113 in words is "one billion, two hundred twenty-one million, ten thousand, one hundred thirteen".