21748010 has 16 divisors (see below), whose sum is σ = 39699072. Its totient is φ = 8576400.

The previous prime is 21748009. The next prime is 21748033. The reversal of 21748010 is 1084712.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 14606 + ... + 16025.

It is an arithmetic number, because the mean of its divisors is an integer number (2481192).

Almost surely, 2^21748010 is an apocalyptic number.

21748010 is a deficient number, since it is larger than the sum of its proper divisors (17951062).

21748010 is a wasteful number, since it uses less digits than its factorization.

21748010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30709.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 21748010 is about 4663.4761712697. The cubic root of 21748010 is about 279.1299951335.

The spelling of 21748010 in words is "twenty-one million, seven hundred forty-eight thousand, ten".