21934230 has 16 divisors (see below), whose sum is σ = 52642224. Its totient is φ = 5849120.

The previous prime is 21934223. The next prime is 21934277. The reversal of 21934230 is 3243912.

It is a super-4 number, since 4×21934230⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21934230.

It is a congruent 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, 365541 + ... + 365600.

It is an arithmetic number, because the mean of its divisors is an integer number (3290139).

Almost surely, 2^21934230 is an apocalyptic number.

21934230 is an abundant number, since it is smaller than the sum of its proper divisors (30707994).

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

21934230 is a wasteful number, since it uses less digits than its factorization.

21934230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731151.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 21934230 is about 4683.3994064141. The cubic root of 21934230 is about 279.9244268833.

The spelling of 21934230 in words is "twenty-one million, nine hundred thirty-four thousand, two hundred thirty".