21338030 has 32 divisors (see below), whose sum is σ = 44798400. Its totient is φ = 7314720.

The previous prime is 21338003. The next prime is 21338039. The reversal of 21338030 is 3083312.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21337993 and 21338011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338039) 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, 320 + ... + 6540.

It is an arithmetic number, because the mean of its divisors is an integer number (1399950).

Almost surely, 2^21338030 is an apocalyptic number.

21338030 is an abundant number, since it is smaller than the sum of its proper divisors (23460370).

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

21338030 is an equidigital number, since it uses as much as digits as its factorization.

21338030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6249 (or 6235 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21338030 is about 4619.3105546174. The cubic root of 21338030 is about 277.3648612892.

The spelling of 21338030 in words is "twenty-one million, three hundred thirty-eight thousand, thirty".