47800021 has 2 divisors, whose sum is σ = 47800022. Its totient is φ = 47800020.

The previous prime is 47800013. The next prime is 47800057. The reversal of 47800021 is 12000874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33466225 + 14333796 = 5785^2 + 3786^2 .

It is a cyclic number.

It is not a de Polignac number, because 47800021 - 2³ = 47800013 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 47799965 and 47800001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47800121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23900010 + 23900011.

It is an arithmetic number, because the mean of its divisors is an integer number (23900011).

Almost surely, 2^47800021 is an apocalyptic number.

It is an amenable number.

47800021 is a deficient number, since it is larger than the sum of its proper divisors (1).

47800021 is an equidigital number, since it uses as much as digits as its factorization.

47800021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 47800021 is about 6913.7559256890. The cubic root of 47800021 is about 362.9187133163.

Adding to 47800021 its reverse (12000874), we get a palindrome (59800895).

The spelling of 47800021 in words is "forty-seven million, eight hundred thousand, twenty-one".