21320234 has 32 divisors (see below), whose sum is σ = 35804160. Its totient is φ = 9459072.

The previous prime is 21320213. The next prime is 21320239. The reversal of 21320234 is 43202312.

It is not an unprimeable number, because it can be changed into a prime (21320239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89087 + ... + 89325.

It is an arithmetic number, because the mean of its divisors is an integer number (1118880).

Almost surely, 2^21320234 is an apocalyptic number.

21320234 is a deficient number, since it is larger than the sum of its proper divisors (14483926).

21320234 is a wasteful number, since it uses less digits than its factorization.

21320234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21320234 is about 4617.3838913393. The cubic root of 21320234 is about 277.2877320522.

Adding to 21320234 its reverse (43202312), we get a palindrome (64522546).

The spelling of 21320234 in words is "twenty-one million, three hundred twenty thousand, two hundred thirty-four".