47581647221 has 8 divisors (see below), whose sum is σ = 48745257624. Its totient is φ = 46418183680.

The previous prime is 47581647167. The next prime is 47581647227. The reversal of 47581647221 is 12274618574.

It can be written as a sum of positive squares in 4 ways, for example, as 13084156996 + 34497490225 = 114386^2 + 185735^2 .

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 47581647221 - 2³⁴ = 30401778037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47581647227) 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, 920171 + ... + 970503.

It is an arithmetic number, because the mean of its divisors is an integer number (6093157203).

Almost surely, 2^47581647221 is an apocalyptic number.

47581647221 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

47581647221 is a deficient number, since it is larger than the sum of its proper divisors (1163610403).

47581647221 is a wasteful number, since it uses less digits than its factorization.

47581647221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73431.

The product of its digits is 752640, while the sum is 47.

The spelling of 47581647221 in words is "forty-seven billion, five hundred eighty-one million, six hundred forty-seven thousand, two hundred twenty-one".