12721237621424 has 80 divisors (see below), whose sum is σ = 26665152696000. Its totient is φ = 5861189419008.

The previous prime is 12721237621381. The next prime is 12721237621441. The reversal of 12721237621424 is 42412673212721.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3464312 + ... + 6119144.

It is an arithmetic number, because the mean of its divisors is an integer number (333314408700).

Almost surely, 2^{12721237621424} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12721237621424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13332576348000).

12721237621424 is an abundant number, since it is smaller than the sum of its proper divisors (13943915074576).

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

12721237621424 is a wasteful number, since it uses less digits than its factorization.

12721237621424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2655342 (or 2655336 counting only the distinct ones).

The product of its digits is 451584, while the sum is 44.

The spelling of 12721237621424 in words is "twelve trillion, seven hundred twenty-one billion, two hundred thirty-seven million, six hundred twenty-one thousand, four hundred twenty-four".