21508880604825 has 12 divisors (see below), whose sum is σ = 35561349266768. Its totient is φ = 11471402989200.

The previous prime is 21508880604821. The next prime is 21508880604847. The reversal of 21508880604825 is 52840608880512.

It is a happy number.

It is not a de Polignac number, because 21508880604825 - 2² = 21508880604821 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21508880604821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143392537291 + ... + 143392537440.

Almost surely, 2^{21508880604825} is an apocalyptic number.

21508880604825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21508880604825 is a deficient number, since it is larger than the sum of its proper divisors (14052468661943).

21508880604825 is a wasteful number, since it uses less digits than its factorization.

21508880604825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286785074744 (or 286785074739 counting only the distinct ones).

The product of its (nonzero) digits is 9830400, while the sum is 57.

The spelling of 21508880604825 in words is "twenty-one trillion, five hundred eight billion, eight hundred eighty million, six hundred four thousand, eight hundred twenty-five".