21354806 has 24 divisors (see below), whose sum is σ = 35686560. Its totient is φ = 9575280.

The previous prime is 21354799. The next prime is 21354847. The reversal of 21354806 is 60845312.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 18560 + ... + 19676.

It is an arithmetic number, because the mean of its divisors is an integer number (1486940).

Almost surely, 2^21354806 is an apocalyptic number.

21354806 is a deficient number, since it is larger than the sum of its proper divisors (14331754).

21354806 is a wasteful number, since it uses less digits than its factorization.

21354806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21354806 is about 4621.1260532472. The cubic root of 21354806 is about 277.4375305098.

The spelling of 21354806 in words is "twenty-one million, three hundred fifty-four thousand, eight hundred six".