21099104807 has 6 divisors (see below), whose sum is σ = 23191578144. Its totient is φ = 19181004260.

The previous prime is 21099104791. The next prime is 21099104827. The reversal of 21099104807 is 70840199012.

It is not a de Polignac number, because 21099104807 - 2⁴ = 21099104791 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 (21099104827) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87186263 + ... + 87186504.

It is an arithmetic number, because the mean of its divisors is an integer number (3865263024).

Almost surely, 2^21099104807 is an apocalyptic number.

21099104807 is a deficient number, since it is larger than the sum of its proper divisors (2092473337).

21099104807 is a wasteful number, since it uses less digits than its factorization.

21099104807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174372789 (or 174372778 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 41.

The spelling of 21099104807 in words is "twenty-one billion, ninety-nine million, one hundred four thousand, eight hundred seven".