21342435 has 16 divisors (see below), whose sum is σ = 34206624. Its totient is φ = 11363072.

The previous prime is 21342421. The next prime is 21342437. The reversal of 21342435 is 53424312.

It is a cyclic number.

It is not a de Polignac number, because 21342435 - 2⁸ = 21342179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21342437) 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, 13549 + ... + 15041.

It is an arithmetic number, because the mean of its divisors is an integer number (2137914).

Almost surely, 2^21342435 is an apocalyptic number.

21342435 is a deficient number, since it is larger than the sum of its proper divisors (12864189).

21342435 is a wasteful number, since it uses less digits than its factorization.

21342435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454.

The product of its digits is 2880, while the sum is 24.

The square root of 21342435 is about 4619.7873327676. The cubic root of 21342435 is about 277.3839462774.

Adding to 21342435 its reverse (53424312), we get a palindrome (74766747).

The spelling of 21342435 in words is "twenty-one million, three hundred forty-two thousand, four hundred thirty-five".