21508880604826 has 16 divisors (see below), whose sum is σ = 32579380873728. Its totient is φ = 10649105082000.

The previous prime is 21508880604821. The next prime is 21508880604847. The reversal of 21508880604826 is 62840608880512.

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 7 ways as a sum of consecutive naturals, for example, 2140105 + ... + 6899116.

It is an arithmetic number, because the mean of its divisors is an integer number (2036211304608).

Almost surely, 2^{21508880604826} is an apocalyptic number.

21508880604826 is a deficient number, since it is larger than the sum of its proper divisors (11070500268902).

21508880604826 is a wasteful number, since it uses less digits than its factorization.

21508880604826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9050877.

The product of its (nonzero) digits is 11796480, while the sum is 58.

The spelling of 21508880604826 in words is "twenty-one trillion, five hundred eight billion, eight hundred eighty million, six hundred four thousand, eight hundred twenty-six".