21293827 has 8 divisors (see below), whose sum is σ = 21560000. Its totient is φ = 21029544.

The previous prime is 21293803. The next prime is 21293861. The reversal of 21293827 is 72839212.

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

It is a cyclic number.

It is not a de Polignac number, because 21293827 - 2¹⁵ = 21261059 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21293792 and 21293801.

It is not an unprimeable number, because it can be changed into a prime (21293887) 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 7 ways as a sum of consecutive naturals, for example, 42424 + ... + 42922.

It is an arithmetic number, because the mean of its divisors is an integer number (2695000).

Almost surely, 2^21293827 is an apocalyptic number.

21293827 is a deficient number, since it is larger than the sum of its proper divisors (266173).

21293827 is a wasteful number, since it uses less digits than its factorization.

21293827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945.

The product of its digits is 12096, while the sum is 34.

The square root of 21293827 is about 4614.5234856917. The cubic root of 21293827 is about 277.1732029412.

The spelling of 21293827 in words is "twenty-one million, two hundred ninety-three thousand, eight hundred twenty-seven".