21013234 has 8 divisors (see below), whose sum is σ = 34385328. Its totient is φ = 9551460.

The previous prime is 21013217. The next prime is 21013249. The reversal of 21013234 is 43231012.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477552 + ... + 477595.

It is an arithmetic number, because the mean of its divisors is an integer number (4298166).

Almost surely, 2^21013234 is an apocalyptic number.

21013234 is a deficient number, since it is larger than the sum of its proper divisors (13372094).

21013234 is a wasteful number, since it uses less digits than its factorization.

21013234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955160.

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

The square root of 21013234 is about 4584.0194153166. The cubic root of 21013234 is about 275.9503603928.

Adding to 21013234 its reverse (43231012), we get a palindrome (64244246).

It can be divided in two parts, 2101 and 3234, that added together give a palindrome (5335).

The spelling of 21013234 in words is "twenty-one million, thirteen thousand, two hundred thirty-four".