21827000827 has 4 divisors (see below), whose sum is σ = 21827654176. Its totient is φ = 21826347480.

The previous prime is 21827000813. The next prime is 21827000873. The reversal of 21827000827 is 72800072812.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21827000827 is a prime.

It is a deceptive number, since it divides R_21827000826.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21827000527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273699 + ... + 344332.

It is an arithmetic number, because the mean of its divisors is an integer number (5456913544).

Almost surely, 2^21827000827 is an apocalyptic number.

21827000827 is a deficient number, since it is larger than the sum of its proper divisors (653349).

21827000827 is an equidigital number, since it uses as much as digits as its factorization.

21827000827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653348.

The product of its (nonzero) digits is 25088, while the sum is 37.

The spelling of 21827000827 in words is "twenty-one billion, eight hundred twenty-seven million, eight hundred twenty-seven", and thus it is an aban number.