21892219 has 4 divisors (see below), whose sum is σ = 21917896. Its totient is φ = 21866544.

The previous prime is 21892207. The next prime is 21892249. The reversal of 21892219 is 91229812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21892219 - 2¹⁵ = 21859451 is a prime.

It is a super-2 number, since 2×21892219² = 958538505487922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21892249) 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 3 ways as a sum of consecutive naturals, for example, 11514 + ... + 13279.

It is an arithmetic number, because the mean of its divisors is an integer number (5479474).

Almost surely, 2^21892219 is an apocalyptic number.

21892219 is a deficient number, since it is larger than the sum of its proper divisors (25677).

21892219 is an equidigital number, since it uses as much as digits as its factorization.

21892219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25676.

The product of its digits is 5184, while the sum is 34.

The square root of 21892219 is about 4678.9121598936. The cubic root of 21892219 is about 279.7455980074.

The spelling of 21892219 in words is "twenty-one million, eight hundred ninety-two thousand, two hundred nineteen".