47671918921 has 27 divisors (see below), whose sum is σ = 54840561517. Its totient is φ = 41405807960.

The previous prime is 47671918901. The next prime is 47671918949. The reversal of 47671918921 is 12981917674.

It is a happy number.

The square root of 47671918921 is 218339.

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

47671918921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 47671918921 - 2¹⁹ = 47671394633 is a prime.

It is a super-2 number, since 2×47671918921² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47671918901) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 55239336 + ... + 55240198.

Almost surely, 2^47671918921 is an apocalyptic number.

47671918921 is the 218339-th square number.

47671918921 is the 109170-th centered octagonal number.

It is an amenable number.

47671918921 is a deficient number, since it is larger than the sum of its proper divisors (7168642596).

47671918921 is an frugal number, since it uses more digits than its factorization.

47671918921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794 (or 897 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 55.

The spelling of 47671918921 in words is "forty-seven billion, six hundred seventy-one million, nine hundred eighteen thousand, nine hundred twenty-one".