25212136105 has 8 divisors (see below), whose sum is σ = 32581837512. Its totient is φ = 18618192768.

The previous prime is 25212136099. The next prime is 25212136111. The reversal of 25212136105 is 50163121252.

It is an interprime number because it is at equal distance from previous prime (25212136099) and next prime (25212136111).

It can be written as a sum of positive squares in 4 ways, for example, as 228856384 + 24983279721 = 15128^2 + 158061^2 .

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 25212136105 - 2⁵ = 25212136073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193939444 + ... + 193939573.

It is an arithmetic number, because the mean of its divisors is an integer number (4072729689).

Almost surely, 2^25212136105 is an apocalyptic number.

It is an amenable number.

25212136105 is a deficient number, since it is larger than the sum of its proper divisors (7369701407).

25212136105 is a wasteful number, since it uses less digits than its factorization.

25212136105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387879035.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 25212136105 its reverse (50163121252), we get a palindrome (75375257357).

The spelling of 25212136105 in words is "twenty-five billion, two hundred twelve million, one hundred thirty-six thousand, one hundred five".