39518482221 has 6 divisors (see below), whose sum is σ = 57082252110. Its totient is φ = 26345654808.

The previous prime is 39518482127. The next prime is 39518482229. The reversal of 39518482221 is 12228481593.

39518482221 is a `hidden beast` number, since 39 + 518 + 4 + 82 + 2 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 38655885321 + 862596900 = 196611^2 + 29370^2 .

It is not a de Polignac number, because 39518482221 - 2¹⁷ = 39518351149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39518482229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2195471226 + ... + 2195471243.

It is an arithmetic number, because the mean of its divisors is an integer number (9513708685).

Almost surely, 2^39518482221 is an apocalyptic number.

It is an amenable number.

39518482221 is a deficient number, since it is larger than the sum of its proper divisors (17563769889).

39518482221 is a wasteful number, since it uses less digits than its factorization.

39518482221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4390942475 (or 4390942472 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The spelling of 39518482221 in words is "thirty-nine billion, five hundred eighteen million, four hundred eighty-two thousand, two hundred twenty-one".