25440421205431 has 4 divisors (see below), whose sum is σ = 25448577804000. Its totient is φ = 25432264606864.

The previous prime is 25440421205411. The next prime is 25440421205443. The reversal of 25440421205431 is 13450212404452.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25440421205431 - 2⁵ = 25440421205399 is a prime.

It is a super-2 number, since 2×25440421205431² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25440421205401) 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, 4078294606 + ... + 4078300843.

It is an arithmetic number, because the mean of its divisors is an integer number (6362144451000).

Almost surely, 2^{25440421205431} is an apocalyptic number.

25440421205431 is a deficient number, since it is larger than the sum of its proper divisors (8156598569).

25440421205431 is an equidigital number, since it uses as much as digits as its factorization.

25440421205431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8156598568.

The product of its (nonzero) digits is 153600, while the sum is 37.

Adding to 25440421205431 its reverse (13450212404452), we get a palindrome (38890633609883).

It can be divided in two parts, 2544042 and 1205431, that added together give a palindrome (3749473).

The spelling of 25440421205431 in words is "twenty-five trillion, four hundred forty billion, four hundred twenty-one million, two hundred five thousand, four hundred thirty-one".