21370827 has 8 divisors (see below), whose sum is σ = 28598416. Its totient is φ = 14195232.

The previous prime is 21370807. The next prime is 21370829. The reversal of 21370827 is 72807312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21370827 - 2¹⁵ = 21338059 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21370794 and 21370803.

It is not an unprimeable number, because it can be changed into a prime (21370829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12028 + ... + 13689.

It is an arithmetic number, because the mean of its divisors is an integer number (3574802).

Almost surely, 2^21370827 is an apocalyptic number.

21370827 is a deficient number, since it is larger than the sum of its proper divisors (7227589).

21370827 is a wasteful number, since it uses less digits than its factorization.

21370827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25997.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 21370827 is about 4622.8591802044. The cubic root of 21370827 is about 277.5068937497.

The spelling of 21370827 in words is "twenty-one million, three hundred seventy thousand, eight hundred twenty-seven".