47821241921 has 4 divisors (see below), whose sum is σ = 47864055252. Its totient is φ = 47778428592.

The previous prime is 47821241891. The next prime is 47821241929. The reversal of 47821241921 is 12914212874.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21218000896 + 26603241025 = 145664^2 + 163105^2 .

It is a cyclic number.

It is not a de Polignac number, because 47821241921 - 2²⁶ = 47754133057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47821241929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21404990 + ... + 21407223.

It is an arithmetic number, because the mean of its divisors is an integer number (11966013813).

Almost surely, 2^47821241921 is an apocalyptic number.

It is an amenable number.

47821241921 is a deficient number, since it is larger than the sum of its proper divisors (42813331).

47821241921 is a wasteful number, since it uses less digits than its factorization.

47821241921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42813330.

The product of its digits is 64512, while the sum is 41.

The spelling of 47821241921 in words is "forty-seven billion, eight hundred twenty-one million, two hundred forty-one thousand, nine hundred twenty-one".