21354035 has 4 divisors (see below), whose sum is σ = 25624848. Its totient is φ = 17083224.

The previous prime is 21354019. The next prime is 21354049. The reversal of 21354035 is 53045312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21354035 - 2⁴ = 21354019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21354035.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2135399 + ... + 2135408.

It is an arithmetic number, because the mean of its divisors is an integer number (6406212).

Almost surely, 2^21354035 is an apocalyptic number.

21354035 is a deficient number, since it is larger than the sum of its proper divisors (4270813).

21354035 is an equidigital number, since it uses as much as digits as its factorization.

21354035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4270812.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 21354035 is about 4621.0426312684. The cubic root of 21354035 is about 277.4341915751.

Adding to 21354035 its reverse (53045312), we get a palindrome (74399347).

The spelling of 21354035 in words is "twenty-one million, three hundred fifty-four thousand, thirty-five".