47721437447 has 2 divisors, whose sum is σ = 47721437448. Its totient is φ = 47721437446.

The previous prime is 47721437441. The next prime is 47721437513. The reversal of 47721437447 is 74473412774.

47721437447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47721437447 - 2⁴ = 47721437431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 47721437395 and 47721437404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47721437441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23860718723 + 23860718724.

It is an arithmetic number, because the mean of its divisors is an integer number (23860718724).

Almost surely, 2^47721437447 is an apocalyptic number.

47721437447 is a deficient number, since it is larger than the sum of its proper divisors (1).

47721437447 is an equidigital number, since it uses as much as digits as its factorization.

47721437447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3687936, while the sum is 50.

The spelling of 47721437447 in words is "forty-seven billion, seven hundred twenty-one million, four hundred thirty-seven thousand, four hundred forty-seven".