21842235 has 12 divisors (see below), whose sum is σ = 37859952. Its totient is φ = 11649168.

The previous prime is 21842221. The next prime is 21842239. The reversal of 21842235 is 53224812.

It is not a de Polignac number, because 21842235 - 2⁹ = 21841723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21842199 and 21842208.

It is not an unprimeable number, because it can be changed into a prime (21842239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 242647 + ... + 242736.

It is an arithmetic number, because the mean of its divisors is an integer number (3154996).

Almost surely, 2^21842235 is an apocalyptic number.

21842235 is a deficient number, since it is larger than the sum of its proper divisors (16017717).

21842235 is a wasteful number, since it uses less digits than its factorization.

21842235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485394 (or 485391 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21842235 is about 4673.5676950270. The cubic root of 21842235 is about 279.5325320582.

The spelling of 21842235 in words is "twenty-one million, eight hundred forty-two thousand, two hundred thirty-five".