21224119 has 16 divisors (see below), whose sum is σ = 25583616. Its totient is φ = 17222400.

The previous prime is 21224087. The next prime is 21224123. The reversal of 21224119 is 91142212.

It is a cyclic number.

It is not a de Polignac number, because 21224119 - 2⁵ = 21224087 is a prime.

It is a super-2 number, since 2×21224119² = 900926454652322, 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 21224119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9159 + ... + 11239.

It is an arithmetic number, because the mean of its divisors is an integer number (1598976).

Almost surely, 2^21224119 is an apocalyptic number.

21224119 is the 2914-th heptagonal number.

21224119 is a deficient number, since it is larger than the sum of its proper divisors (4359497).

21224119 is a wasteful number, since it uses less digits than its factorization.

21224119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166.

The product of its digits is 288, while the sum is 22.

The square root of 21224119 is about 4606.9641847968. The cubic root of 21224119 is about 276.8704186100.

It can be divided in two parts, 2122 and 4119, that added together give a square (6241 = 79²).

The spelling of 21224119 in words is "twenty-one million, two hundred twenty-four thousand, one hundred nineteen".