215120355320421 has 16 divisors (see below), whose sum is σ = 318701350593600. Its totient is φ = 143411532660144.

The previous prime is 215120355320417. The next prime is 215120355320461. The reversal of 215120355320421 is 124023553021512.

215120355320421 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 203 + 5 + 5 + 3 + 20 + 421 = 666.

215120355320421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215120355320421 - 2² = 215120355320417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215120355320401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54661911 + ... + 58465076.

It is an arithmetic number, because the mean of its divisors is an integer number (19918834412100).

Almost surely, 2^{215120355320421} is an apocalyptic number.

It is an amenable number.

215120355320421 is a deficient number, since it is larger than the sum of its proper divisors (103580995273179).

215120355320421 is a wasteful number, since it uses less digits than its factorization.

215120355320421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113197425 (or 113197419 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 215120355320421 in words is "two hundred fifteen trillion, one hundred twenty billion, three hundred fifty-five million, three hundred twenty thousand, four hundred twenty-one".