12111021040 has 40 divisors (see below), whose sum is σ = 29640134160. Its totient is φ = 4589438976.

The previous prime is 12111021029. The next prime is 12111021047. The reversal of 12111021040 is 4012011121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 12111021040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111021047) 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, 3982369 + ... + 3985408.

It is an arithmetic number, because the mean of its divisors is an integer number (741003354).

Almost surely, 2^12111021040 is an apocalyptic number.

12111021040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111021040 is an abundant number, since it is smaller than the sum of its proper divisors (17529113120).

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

12111021040 is a wasteful number, since it uses less digits than its factorization.

12111021040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7967809 (or 7967803 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12111021040 its reverse (4012011121), we get a palindrome (16123032161).

The spelling of 12111021040 in words is "twelve billion, one hundred eleven million, twenty-one thousand, forty".