25121400140 has 72 divisors (see below), whose sum is σ = 56119432992. Its totient is φ = 9444188160.

The previous prime is 25121400121. The next prime is 25121400163. The reversal of 25121400140 is 4100412152.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4754300 + ... + 4759580.

Almost surely, 2^25121400140 is an apocalyptic number.

25121400140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25121400140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28059716496).

25121400140 is an abundant number, since it is smaller than the sum of its proper divisors (30998032852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25121400140 is a wasteful number, since it uses less digits than its factorization.

25121400140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6147 (or 6128 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 25121400140 its reverse (4100412152), we get a palindrome (29221812292).

The spelling of 25121400140 in words is "twenty-five billion, one hundred twenty-one million, four hundred thousand, one hundred forty".