11312223121 has 16 divisors (see below), whose sum is σ = 11750215680. Its totient is φ = 10883013120.

The previous prime is 11312223119. The next prime is 11312223133. The reversal of 11312223121 is 12132221311.

It is a cyclic number.

It is not a de Polignac number, because 11312223121 - 2¹ = 11312223119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11312223421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 863065 + ... + 876073.

It is an arithmetic number, because the mean of its divisors is an integer number (734388480).

Almost surely, 2^11312223121 is an apocalyptic number.

It is an amenable number.

11312223121 is a deficient number, since it is larger than the sum of its proper divisors (437992559).

11312223121 is a wasteful number, since it uses less digits than its factorization.

11312223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13344.

The product of its digits is 144, while the sum is 19.

Adding to 11312223121 its reverse (12132221311), we get a palindrome (23444444432).

The spelling of 11312223121 in words is "eleven billion, three hundred twelve million, two hundred twenty-three thousand, one hundred twenty-one".