47204921 has 2 divisors, whose sum is σ = 47204922. Its totient is φ = 47204920.

The previous prime is 47204891. The next prime is 47204923. The reversal of 47204921 is 12940274.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25452025 + 21752896 = 5045^2 + 4664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47204921 is a prime.

Together with 47204923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (47204923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23602460 + 23602461.

It is an arithmetic number, because the mean of its divisors is an integer number (23602461).

Almost surely, 2^47204921 is an apocalyptic number.

It is an amenable number.

47204921 is a deficient number, since it is larger than the sum of its proper divisors (1).

47204921 is an equidigital number, since it uses as much as digits as its factorization.

47204921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 47204921 is about 6870.5837452141. The cubic root of 47204921 is about 361.4063328823.

The spelling of 47204921 in words is "forty-seven million, two hundred four thousand, nine hundred twenty-one".