12111212140 has 24 divisors (see below), whose sum is σ = 25462582992. Its totient is φ = 4838953920.

The previous prime is 12111212111. The next prime is 12111212149. The reversal of 12111212140 is 4121211121.

It is not an unprimeable number, because it can be changed into a prime (12111212149) 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, 327706 + ... + 362785.

It is an arithmetic number, because the mean of its divisors is an integer number (1060940958).

Almost surely, 2^12111212140 is an apocalyptic number.

12111212140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111212140 is an abundant number, since it is smaller than the sum of its proper divisors (13351370852).

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

12111212140 is a wasteful number, since it uses less digits than its factorization.

12111212140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691377 (or 691375 counting only the distinct ones).

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

Adding to 12111212140 its reverse (4121211121), we get a palindrome (16232423261).

The spelling of 12111212140 in words is "twelve billion, one hundred eleven million, two hundred twelve thousand, one hundred forty".