21035416 has 16 divisors (see below), whose sum is σ = 39672000. Its totient is φ = 10456224.

The previous prime is 21035401. The next prime is 21035429. The reversal of 21035416 is 61453012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6216 + ... + 8983.

It is an arithmetic number, because the mean of its divisors is an integer number (2479500).

Almost surely, 2^21035416 is an apocalyptic number.

It is an amenable number.

21035416 is a deficient number, since it is larger than the sum of its proper divisors (18636584).

21035416 is a wasteful number, since it uses less digits than its factorization.

21035416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15378 (or 15374 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21035416 is about 4586.4382695072. The cubic root of 21035416 is about 276.0474258627.

Adding to 21035416 its reverse (61453012), we get a palindrome (82488428).

The spelling of 21035416 in words is "twenty-one million, thirty-five thousand, four hundred sixteen".