47497407721 has 9 divisors (see below), whose sum is σ = 48539960599. Its totient is φ = 46476799384.

The previous prime is 47497407707. The next prime is 47497407757. The reversal of 47497407721 is 12770479474.

The square root of 47497407721 is 217939.

It is a perfect power (a square), and thus also a powerful number.

47497407721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11941025625 + 35556382096 = 109275^2 + 188564^2 .

It is not a de Polignac number, because 47497407721 - 2⁵ = 47497407689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47497407791) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10240815 + ... + 10245451.

Almost surely, 2^47497407721 is an apocalyptic number.

47497407721 is the 217939-th square number.

47497407721 is the 108970-th centered octagonal number.

It is an amenable number.

47497407721 is a deficient number, since it is larger than the sum of its proper divisors (1042552878).

47497407721 is an frugal number, since it uses more digits than its factorization.

47497407721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9368 (or 4684 counting only the distinct ones).

The product of its (nonzero) digits is 2765952, while the sum is 52.

The spelling of 47497407721 in words is "forty-seven billion, four hundred ninety-seven million, four hundred seven thousand, seven hundred twenty-one".