21196827 has 12 divisors (see below), whose sum is σ = 30720144. Its totient is φ = 14083920.

The previous prime is 21196817. The next prime is 21196831. The reversal of 21196827 is 72869112.

It is not a de Polignac number, because 21196827 - 2⁴ = 21196811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21196791 and 21196800.

It is not an unprimeable number, because it can be changed into a prime (21196817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 988 + ... + 6585.

It is an arithmetic number, because the mean of its divisors is an integer number (2560012).

Almost surely, 2^21196827 is an apocalyptic number.

21196827 is a deficient number, since it is larger than the sum of its proper divisors (9523317).

21196827 is a wasteful number, since it uses less digits than its factorization.

21196827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7890 (or 7887 counting only the distinct ones).

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

The square root of 21196827 is about 4604.0011946132. The cubic root of 21196827 is about 276.7516922265.

The spelling of 21196827 in words is "twenty-one million, one hundred ninety-six thousand, eight hundred twenty-seven".