215477460420721 has 8 divisors (see below), whose sum is σ = 216203685665184. Its totient is φ = 214752456751200.

The previous prime is 215477460420697. The next prime is 215477460420779. The reversal of 215477460420721 is 127024064774512.

215477460420721 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 215477460420721 - 2¹⁷ = 215477460289649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215477460420791) 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, 305040355 + ... + 305745928.

It is an arithmetic number, because the mean of its divisors is an integer number (27025460708148).

Almost surely, 2^{215477460420721} is an apocalyptic number.

It is an amenable number.

215477460420721 is a deficient number, since it is larger than the sum of its proper divisors (726225244463).

215477460420721 is an equidigital number, since it uses as much as digits as its factorization.

215477460420721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610787471.

The product of its (nonzero) digits is 5268480, while the sum is 52.

The spelling of 215477460420721 in words is "two hundred fifteen trillion, four hundred seventy-seven billion, four hundred sixty million, four hundred twenty thousand, seven hundred twenty-one".