425016421 has 4 divisors (see below), whose sum is σ = 426031200. Its totient is φ = 424001644.

The previous prime is 425016409. The next prime is 425016433. The reversal of 425016421 is 124610524.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (425016409) and next prime (425016433).

It is a cyclic number.

It is not a de Polignac number, because 425016421 - 2¹⁵ = 424983653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425016401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506761 + ... + 507598.

It is an arithmetic number, because the mean of its divisors is an integer number (106507800).

Almost surely, 2^425016421 is an apocalyptic number.

It is an amenable number.

425016421 is a deficient number, since it is larger than the sum of its proper divisors (1014779).

425016421 is a wasteful number, since it uses less digits than its factorization.

425016421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014778.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 425016421 is about 20615.9263919912. The cubic root of 425016421 is about 751.8569811813.

Adding to 425016421 its reverse (124610524), we get a palindrome (549626945).

The spelling of 425016421 in words is "four hundred twenty-five million, sixteen thousand, four hundred twenty-one".