12511721240 has 32 divisors (see below), whose sum is σ = 29375347680. Its totient is φ = 4787092992.

The previous prime is 12511721219. The next prime is 12511721291. The reversal of 12511721240 is 4212711521.

12511721240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6798929 + ... + 6800768.

It is an arithmetic number, because the mean of its divisors is an integer number (917979615).

Almost surely, 2^12511721240 is an apocalyptic number.

12511721240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12511721240 is an abundant number, since it is smaller than the sum of its proper divisors (16863626440).

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

12511721240 is a wasteful number, since it uses less digits than its factorization.

12511721240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13599731 (or 13599727 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The spelling of 12511721240 in words is "twelve billion, five hundred eleven million, seven hundred twenty-one thousand, two hundred forty".