21419186 has 4 divisors (see below), whose sum is σ = 32128782. Its totient is φ = 10709592.

The previous prime is 21419173. The next prime is 21419207. The reversal of 21419186 is 68191412.

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

It can be written as a sum of positive squares in only one way, i.e., 21390625 + 28561 = 4625^2 + 169^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5354795 + ... + 5354798.

Almost surely, 2^21419186 is an apocalyptic number.

21419186 is a deficient number, since it is larger than the sum of its proper divisors (10709596).

21419186 is a wasteful number, since it uses less digits than its factorization.

21419186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10709595.

The product of its digits is 3456, while the sum is 32.

The square root of 21419186 is about 4628.0866456885. The cubic root of 21419186 is about 277.7160549913.

The spelling of 21419186 in words is "twenty-one million, four hundred nineteen thousand, one hundred eighty-six".