21219134 has 4 divisors (see below), whose sum is σ = 31828704. Its totient is φ = 10609566.

The previous prime is 21219127. The next prime is 21219161. The reversal of 21219134 is 43191212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5304782 + ... + 5304785.

It is an arithmetic number, because the mean of its divisors is an integer number (7957176).

Almost surely, 2^21219134 is an apocalyptic number.

21219134 is a deficient number, since it is larger than the sum of its proper divisors (10609570).

21219134 is a wasteful number, since it uses less digits than its factorization.

21219134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10609569.

The product of its digits is 432, while the sum is 23.

The square root of 21219134 is about 4606.4231242907. The cubic root of 21219134 is about 276.8487403312.

The spelling of 21219134 in words is "twenty-one million, two hundred nineteen thousand, one hundred thirty-four".