425213221 has 2 divisors, whose sum is σ = 425213222. Its totient is φ = 425213220.

The previous prime is 425213219. The next prime is 425213273. The reversal of 425213221 is 122312524.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 420824196 + 4389025 = 20514^2 + 2095^2 .

It is a cyclic number.

It is not a de Polignac number, because 425213221 - 2¹ = 425213219 is a prime.

Together with 425213219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 425213192 and 425213201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425213291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212606610 + 212606611.

It is an arithmetic number, because the mean of its divisors is an integer number (212606611).

Almost surely, 2^425213221 is an apocalyptic number.

It is an amenable number.

425213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

425213221 is an equidigital number, since it uses as much as digits as its factorization.

425213221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 22.

The square root of 425213221 is about 20620.6988484872. The cubic root of 425213221 is about 751.9730101270.

Adding to 425213221 its reverse (122312524), we get a palindrome (547525745).

The spelling of 425213221 in words is "four hundred twenty-five million, two hundred thirteen thousand, two hundred twenty-one".