21916827 has 6 divisors (see below), whose sum is σ = 31657652. Its totient is φ = 14611212.

The previous prime is 21916793. The next prime is 21916847. The reversal of 21916827 is 72861912.

It is not a de Polignac number, because 21916827 - 2¹¹ = 21914779 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21916791 and 21916800.

It is not an unprimeable number, because it can be changed into a prime (21916847) 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, 1217593 + ... + 1217610.

Almost surely, 2^21916827 is an apocalyptic number.

21916827 is a deficient number, since it is larger than the sum of its proper divisors (9740825).

21916827 is a wasteful number, since it uses less digits than its factorization.

21916827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435209 (or 2435206 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 21916827 is about 4681.5410924182. The cubic root of 21916827 is about 279.8503749903.

The spelling of 21916827 in words is "twenty-one million, nine hundred sixteen thousand, eight hundred twenty-seven".