12215720057421 has 8 divisors (see below), whose sum is σ = 16313036459904. Its totient is φ = 8131108513280.

The previous prime is 12215720057417. The next prime is 12215720057491. The reversal of 12215720057421 is 12475002751221.

12215720057421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12215720057421 - 2² = 12215720057417 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12215720057421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215720057491) 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, 3176212341 + ... + 3176216186.

It is an arithmetic number, because the mean of its divisors is an integer number (2039129557488).

Almost surely, 2^{12215720057421} is an apocalyptic number.

It is an amenable number.

12215720057421 is a deficient number, since it is larger than the sum of its proper divisors (4097316402483).

12215720057421 is an equidigital number, since it uses as much as digits as its factorization.

12215720057421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6352429171.

The product of its (nonzero) digits is 78400, while the sum is 39.

The spelling of 12215720057421 in words is "twelve trillion, two hundred fifteen billion, seven hundred twenty million, fifty-seven thousand, four hundred twenty-one".