25440421205430 has 384 divisors, whose sum is σ = 83535025766400. Its totient is φ = 5217872774400.

The previous prime is 25440421205411. The next prime is 25440421205443. The reversal of 25440421205430 is 3450212404452.

25440421205430 is a `hidden beast` number, since 2 + 5 + 4 + 4 + 0 + 4 + 212 + 0 + 5 + 430 = 666.

It is a super-2 number, since 2×25440421205430² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 3553624191 + ... + 3553631349.

It is an arithmetic number, because the mean of its divisors is an integer number (217539129600).

Almost surely, 2^{25440421205430} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25440421205430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41767512883200).

25440421205430 is an abundant number, since it is smaller than the sum of its proper divisors (58094604560970).

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

25440421205430 is a wasteful number, since it uses less digits than its factorization.

25440421205430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13760 (or 13757 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 36.

Adding to 25440421205430 its reverse (3450212404452), we get a palindrome (28890633609882).

The spelling of 25440421205430 in words is "twenty-five trillion, four hundred forty billion, four hundred twenty-one million, two hundred five thousand, four hundred thirty".