225421502440 has 16 divisors (see below), whose sum is σ = 507198380580. Its totient is φ = 90168600960.

The previous prime is 225421502399. The next prime is 225421502441. The reversal of 225421502440 is 44205124522.

It can be written as a sum of positive squares in 2 ways, for example, as 224397374436 + 1024128004 = 473706^2 + 32002^2 .

It is not an unprimeable number, because it can be changed into a prime (225421502441) 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, 2817768741 + ... + 2817768820.

Almost surely, 2^225421502440 is an apocalyptic number.

225421502440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225421502440 is an abundant number, since it is smaller than the sum of its proper divisors (281776878140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225421502440 is a wasteful number, since it uses less digits than its factorization.

225421502440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5635537572 (or 5635537568 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 225421502440 its reverse (44205124522), we get a palindrome (269626626962).

The spelling of 225421502440 in words is "two hundred twenty-five billion, four hundred twenty-one million, five hundred two thousand, four hundred forty".