1123311231221 has 8 divisors (see below), whose sum is σ = 1130476277664. Its totient is φ = 1116163555920.

The previous prime is 1123311231191. The next prime is 1123311231253. The reversal of 1123311231221 is 1221321133211.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123311231221 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 (1123311231121) 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, 4213031 + ... + 4471716.

It is an arithmetic number, because the mean of its divisors is an integer number (141309534708).

Almost surely, 2^{1123311231221} is an apocalyptic number.

It is an amenable number.

1123311231221 is a deficient number, since it is larger than the sum of its proper divisors (7165046443).

1123311231221 is an equidigital number, since it uses as much as digits as its factorization.

1123311231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8685571.

The product of its digits is 432, while the sum is 23.

Adding to 1123311231221 its reverse (1221321133211), we get a palindrome (2344632364432).

The spelling of 1123311231221 in words is "one trillion, one hundred twenty-three billion, three hundred eleven million, two hundred thirty-one thousand, two hundred twenty-one".