25130535021 has 24 divisors (see below), whose sum is σ = 37155198080. Its totient is φ = 16359065856.

The previous prime is 25130535019. The next prime is 25130535037. The reversal of 25130535021 is 12053503152.

It is a happy number.

25130535021 is a `hidden beast` number, since 2 + 5 + 1 + 305 + 350 + 2 + 1 = 666.

It is not a de Polignac number, because 25130535021 - 2¹ = 25130535019 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 (25130535721) 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 23 ways as a sum of consecutive naturals, for example, 1590060 + ... + 1605786.

Almost surely, 2^25130535021 is an apocalyptic number.

It is an amenable number.

25130535021 is a deficient number, since it is larger than the sum of its proper divisors (12024663059).

25130535021 is a wasteful number, since it uses less digits than its factorization.

25130535021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19905 (or 19902 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The spelling of 25130535021 in words is "twenty-five billion, one hundred thirty million, five hundred thirty-five thousand, twenty-one".