21233205 has 32 divisors (see below), whose sum is σ = 43142400. Its totient is φ = 9706176.

The previous prime is 21233197. The next prime is 21233213. The reversal of 21233205 is 50233212.

It is an interprime number because it is at equal distance from previous prime (21233197) and next prime (21233213).

It is not a de Polignac number, because 21233205 - 2³ = 21233197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10290 + ... + 12179.

It is an arithmetic number, because the mean of its divisors is an integer number (1348200).

Almost surely, 2^21233205 is an apocalyptic number.

It is an amenable number.

21233205 is an abundant number, since it is smaller than the sum of its proper divisors (21909195).

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

21233205 is a wasteful number, since it uses less digits than its factorization.

21233205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22490 (or 22484 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21233205 is about 4607.9501950433. The cubic root of 21233205 is about 276.9099221849.

Adding to 21233205 its reverse (50233212), we get a palindrome (71466417).

The spelling of 21233205 in words is "twenty-one million, two hundred thirty-three thousand, two hundred five".