11312113221 has 24 divisors (see below), whose sum is σ = 16579985760. Its totient is φ = 7431228000.

The previous prime is 11312113213. The next prime is 11312113223. The reversal of 11312113221 is 12231121311.

11312113221 is a `hidden beast` number, since 1 + 131 + 211 + 322 + 1 = 666.

It is not a de Polignac number, because 11312113221 - 2³ = 11312113213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11312113194 and 11312113203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11312113223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162310 + ... + 221288.

It is an arithmetic number, because the mean of its divisors is an integer number (690832740).

Almost surely, 2^11312113221 is an apocalyptic number.

It is an amenable number.

11312113221 is a deficient number, since it is larger than the sum of its proper divisors (5267872539).

11312113221 is a wasteful number, since it uses less digits than its factorization.

11312113221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59297 (or 59294 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11312113221 its reverse (12231121311), we get a palindrome (23543234532).

The spelling of 11312113221 in words is "eleven billion, three hundred twelve million, one hundred thirteen thousand, two hundred twenty-one".