12111142420 has 24 divisors (see below), whose sum is σ = 27389814984. Its totient is φ = 4471806336.

The previous prime is 12111142411. The next prime is 12111142447. The reversal of 12111142420 is 2424111121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 29615364 + 12081527056 = 5442^2 + 109916^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23290399 + ... + 23290918.

It is an arithmetic number, because the mean of its divisors is an integer number (1141242291).

Almost surely, 2^12111142420 is an apocalyptic number.

12111142420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111142420 is an abundant number, since it is smaller than the sum of its proper divisors (15278672564).

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

12111142420 is a wasteful number, since it uses less digits than its factorization.

12111142420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46581339 (or 46581337 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12111142420 its reverse (2424111121), we get a palindrome (14535253541).

The spelling of 12111142420 in words is "twelve billion, one hundred eleven million, one hundred forty-two thousand, four hundred twenty".