21223119 has 4 divisors (see below), whose sum is σ = 28297496. Its totient is φ = 14148744.

The previous prime is 21223093. The next prime is 21223141. The reversal of 21223119 is 91132212.

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

It is not a de Polignac number, because 21223119 - 2¹³ = 21214927 is a prime.

It is a super-2 number, since 2×21223119² = 900841560176322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21223095 and 21223104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3537184 + ... + 3537189.

It is an arithmetic number, because the mean of its divisors is an integer number (7074374).

Almost surely, 2^21223119 is an apocalyptic number.

21223119 is a deficient number, since it is larger than the sum of its proper divisors (7074377).

21223119 is an equidigital number, since it uses as much as digits as its factorization.

21223119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7074376.

The product of its digits is 216, while the sum is 21.

The square root of 21223119 is about 4606.8556521775. The cubic root of 21223119 is about 276.8660701803.

The spelling of 21223119 in words is "twenty-one million, two hundred twenty-three thousand, one hundred nineteen".