478731407221 has 8 divisors (see below), whose sum is σ = 506916930240. Its totient is φ = 450548645568.

The previous prime is 478731407201. The next prime is 478731407227. The reversal of 478731407221 is 122704137874.

It is a happy number.

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

It is not a de Polignac number, because 478731407221 - 2⁹ = 478731406709 is a prime.

It is a super-3 number, since 3×478731407221³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478731407227) 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, 327961 + ... + 1031998.

It is an arithmetic number, because the mean of its divisors is an integer number (63364616280).

Almost surely, 2^478731407221 is an apocalyptic number.

It is an amenable number.

478731407221 is a deficient number, since it is larger than the sum of its proper divisors (28185523019).

478731407221 is a wasteful number, since it uses less digits than its factorization.

478731407221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380683.

The product of its (nonzero) digits is 526848, while the sum is 46.

The spelling of 478731407221 in words is "four hundred seventy-eight billion, seven hundred thirty-one million, four hundred seven thousand, two hundred twenty-one".