21222119 has 4 divisors (see below), whose sum is σ = 21234744. Its totient is φ = 21209496.

The previous prime is 21222043. The next prime is 21222143. The reversal of 21222119 is 91122212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222119 is a prime.

It is a super-2 number, since 2×21222119² = 900756669700322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225119) 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, 3317 + ... + 7310.

It is an arithmetic number, because the mean of its divisors is an integer number (5308686).

Almost surely, 2^21222119 is an apocalyptic number.

21222119 is a deficient number, since it is larger than the sum of its proper divisors (12625).

21222119 is a wasteful number, since it uses less digits than its factorization.

21222119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12624.

The product of its digits is 144, while the sum is 20.

The square root of 21222119 is about 4606.7471170013. The cubic root of 21222119 is about 276.8617216140.

The spelling of 21222119 in words is "twenty-one million, two hundred twenty-two thousand, one hundred nineteen".