25361234131621 has 8 divisors (see below), whose sum is σ = 25396602533120. Its totient is φ = 25325867060208.

The previous prime is 25361234131573. The next prime is 25361234131643. The reversal of 25361234131621 is 12613143216352.

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

It is a cyclic number.

It is not a de Polignac number, because 25361234131621 - 2¹⁷ = 25361234000549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25361234131921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41489635 + ... + 42096463.

It is an arithmetic number, because the mean of its divisors is an integer number (3174575316640).

Almost surely, 2^{25361234131621} is an apocalyptic number.

It is an amenable number.

25361234131621 is a deficient number, since it is larger than the sum of its proper divisors (35368401499).

25361234131621 is an equidigital number, since it uses as much as digits as its factorization.

25361234131621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665043.

The product of its digits is 155520, while the sum is 40.

Adding to 25361234131621 its reverse (12613143216352), we get a palindrome (37974377347973).

The spelling of 25361234131621 in words is "twenty-five trillion, three hundred sixty-one billion, two hundred thirty-four million, one hundred thirty-one thousand, six hundred twenty-one".