21803416 has 16 divisors (see below), whose sum is σ = 42200640. Its totient is φ = 10549920.

The previous prime is 21803407. The next prime is 21803423. The reversal of 21803416 is 61430812.

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, 43711 + ... + 44206.

It is an arithmetic number, because the mean of its divisors is an integer number (2637540).

Almost surely, 2^21803416 is an apocalyptic number.

It is an amenable number.

21803416 is a deficient number, since it is larger than the sum of its proper divisors (20397224).

21803416 is a wasteful number, since it uses less digits than its factorization.

21803416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87954 (or 87950 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21803416 is about 4669.4128110502. The cubic root of 21803416 is about 279.3668346053.

The spelling of 21803416 in words is "twenty-one million, eight hundred three thousand, four hundred sixteen".