11212123121 has 8 divisors (see below), whose sum is σ = 11650457088. Its totient is φ = 10778580000.

The previous prime is 11212123103. The next prime is 11212123127. The reversal of 11212123121 is 12132121211.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11212123121 - 2¹⁸ = 11211860977 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 11212123121.

It is not an unprimeable number, because it can be changed into a prime (11212123127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1192940 + ... + 1202301.

It is an arithmetic number, because the mean of its divisors is an integer number (1456307136).

Almost surely, 2^11212123121 is an apocalyptic number.

It is an amenable number.

11212123121 is a deficient number, since it is larger than the sum of its proper divisors (438333967).

11212123121 is a wasteful number, since it uses less digits than its factorization.

11212123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2395423.

The product of its digits is 48, while the sum is 17.

Adding to 11212123121 its reverse (12132121211), we get a palindrome (23344244332).

The spelling of 11212123121 in words is "eleven billion, two hundred twelve million, one hundred twenty-three thousand, one hundred twenty-one".