1221351113 has 8 divisors (see below), whose sum is σ = 1262031360. Its totient is φ = 1180751040.

The previous prime is 1221351073. The next prime is 1221351137. The reversal of 1221351113 is 3111531221.

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 1221351113 - 2⁸ = 1221350857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221351713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11756 + ... + 50802.

It is an arithmetic number, because the mean of its divisors is an integer number (157753920).

Almost surely, 2^1221351113 is an apocalyptic number.

It is an amenable number.

1221351113 is a deficient number, since it is larger than the sum of its proper divisors (40680247).

1221351113 is a wasteful number, since it uses less digits than its factorization.

1221351113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40087.

The product of its digits is 180, while the sum is 20.

The square root of 1221351113 is about 34947.8341675132. The cubic root of 1221351113 is about 1068.9240393795.

Adding to 1221351113 its reverse (3111531221), we get a palindrome (4332882334).

The spelling of 1221351113 in words is "one billion, two hundred twenty-one million, three hundred fifty-one thousand, one hundred thirteen".