25515348021 has 12 divisors (see below), whose sum is σ = 36856889472. Its totient is φ = 17009591976.

The previous prime is 25515348013. The next prime is 25515348101. The reversal of 25515348021 is 12084351552.

25515348021 is a `hidden beast` number, since 2 + 5 + 5 + 153 + 480 + 21 = 666.

It is not a de Polignac number, because 25515348021 - 2³ = 25515348013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25515347021) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 423630 + ... + 480096.

It is an arithmetic number, because the mean of its divisors is an integer number (3071407456).

Almost surely, 2^25515348021 is an apocalyptic number.

It is an amenable number.

25515348021 is a deficient number, since it is larger than the sum of its proper divisors (11341541451).

25515348021 is a wasteful number, since it uses less digits than its factorization.

25515348021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106680 (or 106677 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

Adding to 25515348021 its reverse (12084351552), we get a palindrome (37599699573).

The spelling of 25515348021 in words is "twenty-five billion, five hundred fifteen million, three hundred forty-eight thousand, twenty-one".