12121222111 has 8 divisors (see below), whose sum is σ = 12696330240. Its totient is φ = 11550122232.

The previous prime is 12121222063. The next prime is 12121222117. The reversal of 12121222111 is 11122212121.

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 12121222111 - 2¹¹ = 12121220063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121222117) 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, 995871 + ... + 1007968.

It is an arithmetic number, because the mean of its divisors is an integer number (1587041280).

Almost surely, 2^12121222111 is an apocalyptic number.

12121222111 is a deficient number, since it is larger than the sum of its proper divisors (575108129).

12121222111 is a wasteful number, since it uses less digits than its factorization.

12121222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004125.

The product of its digits is 32, while the sum is 16.

Adding to 12121222111 its reverse (11122212121), we get a palindrome (23243434232).

The spelling of 12121222111 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".