425432221 has 2 divisors, whose sum is σ = 425432222. Its totient is φ = 425432220.

The previous prime is 425432209. The next prime is 425432243. The reversal of 425432221 is 122234524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 333464121 + 91968100 = 18261^2 + 9590^2 .

It is a cyclic number.

It is not a de Polignac number, because 425432221 - 2²⁷ = 291214493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425432281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212716110 + 212716111.

It is an arithmetic number, because the mean of its divisors is an integer number (212716111).

Almost surely, 2^425432221 is an apocalyptic number.

It is an amenable number.

425432221 is a deficient number, since it is larger than the sum of its proper divisors (1).

425432221 is an equidigital number, since it uses as much as digits as its factorization.

425432221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 25.

The square root of 425432221 is about 20626.0083632292. The cubic root of 425432221 is about 752.1020856251.

Adding to 425432221 its reverse (122234524), we get a palindrome (547666745).

The spelling of 425432221 in words is "four hundred twenty-five million, four hundred thirty-two thousand, two hundred twenty-one".