1221221311113 has 8 divisors (see below), whose sum is σ = 1628301276000. Its totient is φ = 814144443488.

The previous prime is 1221221311069. The next prime is 1221221311151. The reversal of 1221221311113 is 3111131221221.

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 1221221311113 - 2¹³ = 1221221302921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221221311113.

It is not an unprimeable number, because it can be changed into a prime (1221221311813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400213 + ... + 1613261.

It is an arithmetic number, because the mean of its divisors is an integer number (203537659500).

Almost surely, 2^{1221221311113} is an apocalyptic number.

It is an amenable number.

1221221311113 is a deficient number, since it is larger than the sum of its proper divisors (407079964887).

1221221311113 is a wasteful number, since it uses less digits than its factorization.

1221221311113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548631.

The product of its digits is 144, while the sum is 21.

Adding to 1221221311113 its reverse (3111131221221), we get a palindrome (4332352532334).

The spelling of 1221221311113 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, three hundred eleven thousand, one hundred thirteen".