21433235 has 8 divisors (see below), whose sum is σ = 27073680. Its totient is φ = 16244064.

The previous prime is 21433231. The next prime is 21433259. The reversal of 21433235 is 53233412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21433235 - 2² = 21433231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21433235.

It is not an unprimeable number, because it can be changed into a prime (21433231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112712 + ... + 112901.

It is an arithmetic number, because the mean of its divisors is an integer number (3384210).

Almost surely, 2^21433235 is an apocalyptic number.

21433235 is a deficient number, since it is larger than the sum of its proper divisors (5640445).

21433235 is a wasteful number, since it uses less digits than its factorization.

21433235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225637.

The product of its digits is 2160, while the sum is 23.

The square root of 21433235 is about 4629.6041947449. The cubic root of 21433235 is about 277.7767603815.

Adding to 21433235 its reverse (53233412), we get a palindrome (74666647).

The spelling of 21433235 in words is "twenty-one million, four hundred thirty-three thousand, two hundred thirty-five".