47916591021 has 12 divisors (see below), whose sum is σ = 74536919548. Its totient is φ = 29487132864.

The previous prime is 47916591013. The next prime is 47916591053. The reversal of 47916591021 is 12019561974.

47916591021 is a `hidden beast` number, since 47 + 9 + 16 + 591 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4740322500 + 43176268521 = 68850^2 + 207789^2 .

It is not a de Polignac number, because 47916591021 - 2³ = 47916591013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47916591071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204771640 + ... + 204771873.

Almost surely, 2^47916591021 is an apocalyptic number.

It is an amenable number.

47916591021 is a deficient number, since it is larger than the sum of its proper divisors (26620328527).

47916591021 is a wasteful number, since it uses less digits than its factorization.

47916591021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409543532 (or 409543529 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The spelling of 47916591021 in words is "forty-seven billion, nine hundred sixteen million, five hundred ninety-one thousand, twenty-one".