11223121311 has 12 divisors (see below), whose sum is σ = 16649315592. Its totient is φ = 7279862256.

The previous prime is 11223121309. The next prime is 11223121337. The reversal of 11223121311 is 11312132211.

11223121311 is a `hidden beast` number, since 11 + 223 + 121 + 311 = 666.

It is not a de Polignac number, because 11223121311 - 2¹ = 11223121309 is a prime.

It is a super-2 number, since 2×11223121311² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11223121361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16851201 + ... + 16851866.

It is an arithmetic number, because the mean of its divisors is an integer number (1387442966).

Almost surely, 2^11223121311 is an apocalyptic number.

11223121311 is a deficient number, since it is larger than the sum of its proper divisors (5426194281).

11223121311 is a wasteful number, since it uses less digits than its factorization.

11223121311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33703110 (or 33703107 counting only the distinct ones).

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

Adding to 11223121311 its reverse (11312132211), we get a palindrome (22535253522).

It can be divided in two parts, 11 and 223121311, that added together give a palindrome (223121322).

The spelling of 11223121311 in words is "eleven billion, two hundred twenty-three million, one hundred twenty-one thousand, three hundred eleven".