25010000121 has 4 divisors (see below), whose sum is σ = 33346666832. Its totient is φ = 16673333412.

The previous prime is 25010000117. The next prime is 25010000131. The reversal of 25010000121 is 12100001052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25010000121 - 2² = 25010000117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25010000097 and 25010000106.

It is not an unprimeable number, because it can be changed into a prime (25010000101) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4168333351 + ... + 4168333356.

It is an arithmetic number, because the mean of its divisors is an integer number (8336666708).

Almost surely, 2^25010000121 is an apocalyptic number.

It is an amenable number.

25010000121 is a deficient number, since it is larger than the sum of its proper divisors (8336666711).

25010000121 is an equidigital number, since it uses as much as digits as its factorization.

25010000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8336666710.

The product of its (nonzero) digits is 20, while the sum is 12.

Adding to 25010000121 its reverse (12100001052), we get a palindrome (37110001173).

The spelling of 25010000121 in words is "twenty-five billion, ten million, one hundred twenty-one", and thus it is an aban number.