25244135421 has 8 divisors (see below), whose sum is σ = 33659683200. Its totient is φ = 16829005632.

The previous prime is 25244135407. The next prime is 25244135437. The reversal of 25244135421 is 12453144252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-25244135421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25244135491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86076 + ... + 240618.

It is an arithmetic number, because the mean of its divisors is an integer number (4207460400).

Almost surely, 2^25244135421 is an apocalyptic number.

It is an amenable number.

25244135421 is a deficient number, since it is larger than the sum of its proper divisors (8415547779).

25244135421 is a wasteful number, since it uses less digits than its factorization.

25244135421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208995.

The product of its digits is 38400, while the sum is 33.

Adding to 25244135421 its reverse (12453144252), we get a palindrome (37697279673).

The spelling of 25244135421 in words is "twenty-five billion, two hundred forty-four million, one hundred thirty-five thousand, four hundred twenty-one".