47234821 has 4 divisors (see below), whose sum is σ = 47248812. Its totient is φ = 47220832.

The previous prime is 47234813. The next prime is 47234843. The reversal of 47234821 is 12843274.

47234821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12843274 = 2 ⋅6421637.

It can be written as a sum of positive squares in 2 ways, for example, as 29920900 + 17313921 = 5470^2 + 4161^2 .

It is a cyclic number.

It is not a de Polignac number, because 47234821 - 2³ = 47234813 is a prime.

It is a super-2 number, since 2×47234821² = 4462256629804082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47234851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1545 + ... + 9841.

It is an arithmetic number, because the mean of its divisors is an integer number (11812203).

Almost surely, 2^47234821 is an apocalyptic number.

It is an amenable number.

47234821 is a deficient number, since it is larger than the sum of its proper divisors (13991).

47234821 is an equidigital number, since it uses as much as digits as its factorization.

47234821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13990.

The product of its digits is 10752, while the sum is 31.

The square root of 47234821 is about 6872.7593439608. The cubic root of 47234821 is about 361.4826227294.

The spelling of 47234821 in words is "forty-seven million, two hundred thirty-four thousand, eight hundred twenty-one".