10215128627321 has 4 divisors (see below), whose sum is σ = 10215275912100. Its totient is φ = 10214981342544.

The previous prime is 10215128627317. The next prime is 10215128627323. The reversal of 10215128627321 is 12372682151201.

It is a happy number.

10215128627321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3641360815225 + 6573767812096 = 1908235^2 + 2563936^2 .

It is a cyclic number.

It is not a de Polignac number, because 10215128627321 - 2² = 10215128627317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10215128627323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73538306 + ... + 73677083.

It is an arithmetic number, because the mean of its divisors is an integer number (2553818978025).

Almost surely, 2^{10215128627321} is an apocalyptic number.

It is an amenable number.

10215128627321 is a deficient number, since it is larger than the sum of its proper divisors (147284779).

10215128627321 is an equidigital number, since it uses as much as digits as its factorization.

10215128627321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147284778.

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 10215128627321 in words is "ten trillion, two hundred fifteen billion, one hundred twenty-eight million, six hundred twenty-seven thousand, three hundred twenty-one".