21130234 has 8 divisors (see below), whose sum is σ = 31872960. Its totient is φ = 10505916.

The previous prime is 21130231. The next prime is 21130247. The reversal of 21130234 is 43203112.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21130231) 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, 29154 + ... + 29869.

It is an arithmetic number, because the mean of its divisors is an integer number (3984120).

Almost surely, 2^21130234 is an apocalyptic number.

21130234 is a deficient number, since it is larger than the sum of its proper divisors (10742726).

21130234 is a wasteful number, since it uses less digits than its factorization.

21130234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59204.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21130234 is about 4596.7634265861. The cubic root of 21130234 is about 276.4615692582.

Adding to 21130234 its reverse (43203112), we get a palindrome (64333346).

The spelling of 21130234 in words is "twenty-one million, one hundred thirty thousand, two hundred thirty-four".