12111222402 has 48 divisors (see below), whose sum is σ = 27697637760. Its totient is φ = 3814135776.

The previous prime is 12111222397. The next prime is 12111222413. The reversal of 12111222402 is 20422211121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77268 + ... + 173760.

It is an arithmetic number, because the mean of its divisors is an integer number (577034120).

Almost surely, 2^12111222402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12111222402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13848818880).

12111222402 is an abundant number, since it is smaller than the sum of its proper divisors (15586415358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12111222402 is a wasteful number, since it uses less digits than its factorization.

12111222402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96887 (or 96884 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12111222402 its reverse (20422211121), we get a palindrome (32533433523).

The spelling of 12111222402 in words is "twelve billion, one hundred eleven million, two hundred twenty-two thousand, four hundred two".