21120234 has 16 divisors (see below), whose sum is σ = 42716160. Its totient is φ = 6960800.

The previous prime is 21120223. The next prime is 21120251. The reversal of 21120234 is 43202112.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19242 + ... + 20309.

It is an arithmetic number, because the mean of its divisors is an integer number (2669760).

Almost surely, 2^21120234 is an apocalyptic number.

21120234 is an abundant number, since it is smaller than the sum of its proper divisors (21595926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21120234 is a wasteful number, since it uses less digits than its factorization.

21120234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39645.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21120234 is about 4595.6755760171. The cubic root of 21120234 is about 276.4179500547.

Adding to 21120234 its reverse (43202112), we get a palindrome (64322346).

The spelling of 21120234 in words is "twenty-one million, one hundred twenty thousand, two hundred thirty-four".