523204421 has 2 divisors, whose sum is σ = 523204422. Its totient is φ = 523204420.

The previous prime is 523204373. The next prime is 523204433. The reversal of 523204421 is 124402325.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 479829025 + 43375396 = 21905^2 + 6586^2 .

It is a cyclic number.

It is not a de Polignac number, because 523204421 - 2¹⁰ = 523203397 is a prime.

It is a super-3 number, since 3×523204421³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523204481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261602210 + 261602211.

It is an arithmetic number, because the mean of its divisors is an integer number (261602211).

Almost surely, 2^523204421 is an apocalyptic number.

It is an amenable number.

523204421 is a deficient number, since it is larger than the sum of its proper divisors (1).

523204421 is an equidigital number, since it uses as much as digits as its factorization.

523204421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 523204421 is about 22873.6621685291. The cubic root of 523204421 is about 805.7935777253.

Adding to 523204421 its reverse (124402325), we get a palindrome (647606746).

The spelling of 523204421 in words is "five hundred twenty-three million, two hundred four thousand, four hundred twenty-one".