21799211 has 16 divisors (see below), whose sum is σ = 25657344. Its totient is φ = 18134304.

The previous prime is 21799199. The next prime is 21799241. The reversal of 21799211 is 11299712.

It is a cyclic number.

It is not a de Polignac number, because 21799211 - 2²² = 17604907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21799241) 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 15 ways as a sum of consecutive naturals, for example, 56726 + ... + 57108.

It is an arithmetic number, because the mean of its divisors is an integer number (1603584).

Almost surely, 2^21799211 is an apocalyptic number.

21799211 is a deficient number, since it is larger than the sum of its proper divisors (3858133).

21799211 is a wasteful number, since it uses less digits than its factorization.

21799211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610.

The product of its digits is 2268, while the sum is 32.

The square root of 21799211 is about 4668.9625185902. The cubic root of 21799211 is about 279.3488739171.

The spelling of 21799211 in words is "twenty-one million, seven hundred ninety-nine thousand, two hundred eleven".