425207421 has 16 divisors (see below), whose sum is σ = 630573120. Its totient is φ = 283185360.

The previous prime is 425207413. The next prime is 425207459. The reversal of 425207421 is 124702524.

It is not a de Polignac number, because 425207421 - 2³ = 425207413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425207221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21226 + ... + 36068.

It is an arithmetic number, because the mean of its divisors is an integer number (39410820).

Almost surely, 2^425207421 is an apocalyptic number.

It is an amenable number.

425207421 is a deficient number, since it is larger than the sum of its proper divisors (205365699).

425207421 is a wasteful number, since it uses less digits than its factorization.

425207421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15913 (or 15907 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 425207421 is about 20620.5582126188. The cubic root of 425207421 is about 751.9695910868.

Adding to 425207421 its reverse (124702524), we get a palindrome (549909945).

The spelling of 425207421 in words is "four hundred twenty-five million, two hundred seven thousand, four hundred twenty-one".