21734235 has 24 divisors (see below), whose sum is σ = 37818144. Its totient is φ = 11546880.

The previous prime is 21734213. The next prime is 21734261. The reversal of 21734235 is 53243712.

It is not a de Polignac number, because 21734235 - 2⁵ = 21734203 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21734199 and 21734208.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13219 + ... + 14771.

It is an arithmetic number, because the mean of its divisors is an integer number (1575756).

Almost surely, 2^21734235 is an apocalyptic number.

21734235 is a deficient number, since it is larger than the sum of its proper divisors (16083909).

21734235 is a wasteful number, since it uses less digits than its factorization.

21734235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875 (or 1872 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 21734235 is about 4661.9990347489. Note that the first 3 decimals coincide. The cubic root of 21734235 is about 279.0710498512.

Adding to 21734235 its reverse (53243712), we get a palindrome (74977947).

The spelling of 21734235 in words is "twenty-one million, seven hundred thirty-four thousand, two hundred thirty-five".