21881827827 has 12 divisors (see below), whose sum is σ = 31837795080. Its totient is φ = 14481403488.

The previous prime is 21881827811. The next prime is 21881827867. The reversal of 21881827827 is 72872818812.

It is a happy number.

It is not a de Polignac number, because 21881827827 - 2⁴ = 21881827811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21881827867) 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, 8872177 + ... + 8874642.

It is an arithmetic number, because the mean of its divisors is an integer number (2653149590).

Almost surely, 2^21881827827 is an apocalyptic number.

21881827827 is a deficient number, since it is larger than the sum of its proper divisors (9955967253).

21881827827 is a wasteful number, since it uses less digits than its factorization.

21881827827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17746962 (or 17746959 counting only the distinct ones).

The product of its digits is 1605632, while the sum is 54.

The spelling of 21881827827 in words is "twenty-one billion, eight hundred eighty-one million, eight hundred twenty-seven thousand, eight hundred twenty-seven".