21711219 has 8 divisors (see below), whose sum is σ = 29247120. Its totient is φ = 14324736.

The previous prime is 21711163. The next prime is 21711229. The reversal of 21711219 is 91211712.

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

It is not a de Polignac number, because 21711219 - 2⁸ = 21710963 is a prime.

It is a super-2 number, since 2×21711219² = 942754060931922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21711229) 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, 37014 + ... + 37595.

It is an arithmetic number, because the mean of its divisors is an integer number (3655890).

Almost surely, 2^21711219 is an apocalyptic number.

21711219 is a deficient number, since it is larger than the sum of its proper divisors (7535901).

21711219 is an equidigital number, since it uses as much as digits as its factorization.

21711219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74709.

The product of its digits is 252, while the sum is 24.

The square root of 21711219 is about 4659.5299119117. The cubic root of 21711219 is about 278.9725053519.

The spelling of 21711219 in words is "twenty-one million, seven hundred eleven thousand, two hundred nineteen".