21673828899 has 12 divisors (see below), whose sum is σ = 31325443656. Its totient is φ = 14440541472.

The previous prime is 21673828879. The next prime is 21673828909. The reversal of 21673828899 is 99882837612.

21673828899 is a `hidden beast` number, since 2 + 167 + 382 + 8 + 8 + 99 = 666.

It is not a de Polignac number, because 21673828899 - 2⁸ = 21673828643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21673828859) 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, 707314 + ... + 737319.

It is an arithmetic number, because the mean of its divisors is an integer number (2610453638).

Almost surely, 2^21673828899 is an apocalyptic number.

21673828899 is a deficient number, since it is larger than the sum of its proper divisors (9651614757).

21673828899 is a wasteful number, since it uses less digits than its factorization.

21673828899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446306 (or 1446303 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 21673828899 in words is "twenty-one billion, six hundred seventy-three million, eight hundred twenty-eight thousand, eight hundred ninety-nine".