475240021 has 2 divisors, whose sum is σ = 475240022. Its totient is φ = 475240020.

The previous prime is 475239997. The next prime is 475240039. The reversal of 475240021 is 120042574.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 258855921 + 216384100 = 16089^2 + 14710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-475240021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (475240091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237620010 + 237620011.

It is an arithmetic number, because the mean of its divisors is an integer number (237620011).

Almost surely, 2^475240021 is an apocalyptic number.

It is an amenable number.

475240021 is a deficient number, since it is larger than the sum of its proper divisors (1).

475240021 is an equidigital number, since it uses as much as digits as its factorization.

475240021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 475240021 is about 21800.0004816514. Note that the first 3 decimals coincide. The cubic root of 475240021 is about 780.3767744699.

Adding to 475240021 its reverse (120042574), we get a palindrome (595282595).

The spelling of 475240021 in words is "four hundred seventy-five million, two hundred forty thousand, twenty-one".