21800470 has 16 divisors (see below), whose sum is σ = 39327120. Its totient is φ = 8701024.

The previous prime is 21800453. The next prime is 21800483. The reversal of 21800470 is 7400812.

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 7 ways as a sum of consecutive naturals, for example, 2949 + ... + 7231.

It is an arithmetic number, because the mean of its divisors is an integer number (2457945).

Almost surely, 2^21800470 is an apocalyptic number.

21800470 is a deficient number, since it is larger than the sum of its proper divisors (17526650).

21800470 is a wasteful number, since it uses less digits than its factorization.

21800470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4799.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 21800470 is about 4669.0973431703. The cubic root of 21800470 is about 279.3542516876.

The spelling of 21800470 in words is "twenty-one million, eight hundred thousand, four hundred seventy".