11312121223 has 16 divisors (see below), whose sum is σ = 12256792576. Its totient is φ = 10378251360.

The previous prime is 11312121193. The next prime is 11312121253. The reversal of 11312121223 is 32212121311.

It is an interprime number because it is at equal distance from previous prime (11312121193) and next prime (11312121253).

It is a cyclic number.

It is not a de Polignac number, because 11312121223 - 2¹³ = 11312113031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11312121223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11312121253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2000386 + ... + 2006032.

It is an arithmetic number, because the mean of its divisors is an integer number (766049536).

Almost surely, 2^11312121223 is an apocalyptic number.

11312121223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11312121223 is a deficient number, since it is larger than the sum of its proper divisors (944671353).

11312121223 is a wasteful number, since it uses less digits than its factorization.

11312121223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6574.

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

Adding to 11312121223 its reverse (32212121311), we get a palindrome (43524242534).

The spelling of 11312121223 in words is "eleven billion, three hundred twelve million, one hundred twenty-one thousand, two hundred twenty-three".