21119221 has 8 divisors (see below), whose sum is σ = 22798080. Its totient is φ = 19503792.

The previous prime is 21119213. The next prime is 21119233. The reversal of 21119221 is 12291112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21119221 - 2³ = 21119213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21119291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15165 + ... + 16498.

It is an arithmetic number, because the mean of its divisors is an integer number (2849760).

Almost surely, 2^21119221 is an apocalyptic number.

It is an amenable number.

21119221 is a deficient number, since it is larger than the sum of its proper divisors (1678859).

21119221 is a wasteful number, since it uses less digits than its factorization.

21119221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31715.

The product of its digits is 72, while the sum is 19.

The square root of 21119221 is about 4595.5653623901. The cubic root of 21119221 is about 276.4135306614.

The spelling of 21119221 in words is "twenty-one million, one hundred nineteen thousand, two hundred twenty-one".