25121400139 has 4 divisors (see below), whose sum is σ = 27405163800. Its totient is φ = 22837636480.

The previous prime is 25121400121. The next prime is 25121400163. The reversal of 25121400139 is 93100412152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25121400139 - 2⁷ = 25121400011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25121400119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1141881814 + ... + 1141881835.

It is an arithmetic number, because the mean of its divisors is an integer number (6851290950).

Almost surely, 2^25121400139 is an apocalyptic number.

25121400139 is a deficient number, since it is larger than the sum of its proper divisors (2283763661).

25121400139 is a wasteful number, since it uses less digits than its factorization.

25121400139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283763660.

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 25121400139 in words is "twenty-five billion, one hundred twenty-one million, four hundred thousand, one hundred thirty-nine".