425504421 has 12 divisors (see below), whose sum is σ = 637381472. Its totient is φ = 283669452.

The previous prime is 425504413. The next prime is 425504423. The reversal of 425504421 is 124405524.

It is not a de Polignac number, because 425504421 - 2³ = 425504413 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425504423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 875281 + ... + 875766.

Almost surely, 2^425504421 is an apocalyptic number.

It is an amenable number.

425504421 is a deficient number, since it is larger than the sum of its proper divisors (211877051).

425504421 is an equidigital number, since it uses as much as digits as its factorization.

425504421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751062 (or 1751050 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 425504421 is about 20627.7585064398. The cubic root of 425504421 is about 752.1446295733.

Adding to 425504421 its reverse (124405524), we get a palindrome (549909945).

It can be divided in two parts, 42550 and 4421, that added together give a triangular number (46971 = T₃₀₆).

The spelling of 425504421 in words is "four hundred twenty-five million, five hundred four thousand, four hundred twenty-one".