472904221 has 2 divisors, whose sum is σ = 472904222. Its totient is φ = 472904220.

The previous prime is 472904207. The next prime is 472904227. The reversal of 472904221 is 122409274.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 461648196 + 11256025 = 21486^2 + 3355^2 .

It is a cyclic number.

It is not a de Polignac number, because 472904221 - 2⁷ = 472904093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (472904227) 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 as a sum of consecutive naturals, namely, 236452110 + 236452111.

It is an arithmetic number, because the mean of its divisors is an integer number (236452111).

Almost surely, 2^472904221 is an apocalyptic number.

It is an amenable number.

472904221 is a deficient number, since it is larger than the sum of its proper divisors (1).

472904221 is an equidigital number, since it uses as much as digits as its factorization.

472904221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 472904221 is about 21746.3610978941. The cubic root of 472904221 is about 779.0961593947.

The spelling of 472904221 in words is "four hundred seventy-two million, nine hundred four thousand, two hundred twenty-one".