1231113011221 has 8 divisors (see below), whose sum is σ = 1261618789184. Its totient is φ = 1200964026240.

The previous prime is 1231113011213. The next prime is 1231113011243. The reversal of 1231113011221 is 1221103111321.

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 1231113011221 - 2³ = 1231113011213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231113011291) 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, 89191260 + ... + 89205061.

It is an arithmetic number, because the mean of its divisors is an integer number (157702348648).

Almost surely, 2^{1231113011221} is an apocalyptic number.

It is an amenable number.

1231113011221 is a deficient number, since it is larger than the sum of its proper divisors (30505777963).

1231113011221 is a wasteful number, since it uses less digits than its factorization.

1231113011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178396491.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1231113011221 its reverse (1221103111321), we get a palindrome (2452216122542).

The spelling of 1231113011221 in words is "one trillion, two hundred thirty-one billion, one hundred thirteen million, eleven thousand, two hundred twenty-one".