21299827 has 8 divisors (see below), whose sum is σ = 23162976. Its totient is φ = 19504512.

The previous prime is 21299813. The next prime is 21299843. The reversal of 21299827 is 72899212.

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 21299827 - 2¹¹ = 21297779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21299827.

It is not an unprimeable number, because it can be changed into a prime (21299807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16303 + ... + 17560.

It is an arithmetic number, because the mean of its divisors is an integer number (2895372).

Almost surely, 2^21299827 is an apocalyptic number.

21299827 is a deficient number, since it is larger than the sum of its proper divisors (1863149).

21299827 is a wasteful number, since it uses less digits than its factorization.

21299827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33917.

The product of its digits is 36288, while the sum is 40.

The square root of 21299827 is about 4615.1735612001. The cubic root of 21299827 is about 277.1992336940.

The spelling of 21299827 in words is "twenty-one million, two hundred ninety-nine thousand, eight hundred twenty-seven".