11321212123 has 8 divisors (see below), whose sum is σ = 12199411728. Its totient is φ = 10444060704.

The previous prime is 11321212117. The next prime is 11321212127. The reversal of 11321212123 is 32121212311.

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-11321212123 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 11321212123.

It is not an unprimeable number, because it can be changed into a prime (11321212127) 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, 239536 + ... + 282877.

It is an arithmetic number, because the mean of its divisors is an integer number (1524926466).

Almost surely, 2^11321212123 is an apocalyptic number.

11321212123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11321212123 is a deficient number, since it is larger than the sum of its proper divisors (878199605).

11321212123 is a wasteful number, since it uses less digits than its factorization.

11321212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524093.

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

Adding to 11321212123 its reverse (32121212311), we get a palindrome (43442424434).

It can be divided in two parts, 11 and 321212123, that multiplied together give a palindrome (3533333353).

The spelling of 11321212123 in words is "eleven billion, three hundred twenty-one million, two hundred twelve thousand, one hundred twenty-three".