47318281921 has 16 divisors (see below), whose sum is σ = 49427988480. Its totient is φ = 45245756160.

The previous prime is 47318281873. The next prime is 47318281943. The reversal of 47318281921 is 12918281374.

It is a cyclic number.

It is not a de Polignac number, because 47318281921 - 2¹⁹ = 47317757633 is a prime.

It is a Duffinian number.

Its product of digits (193536) is a multiple of the sum of its prime divisors (12096).

It is not an unprimeable number, because it can be changed into a prime (47318281981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4583061 + ... + 4593373.

It is an arithmetic number, because the mean of its divisors is an integer number (3089249280).

Almost surely, 2^47318281921 is an apocalyptic number.

It is an amenable number.

47318281921 is a deficient number, since it is larger than the sum of its proper divisors (2109706559).

47318281921 is a wasteful number, since it uses less digits than its factorization.

47318281921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12096.

The product of its digits is 193536, while the sum is 46.

The spelling of 47318281921 in words is "forty-seven billion, three hundred eighteen million, two hundred eighty-one thousand, nine hundred twenty-one".