21741803 has 6 divisors (see below), whose sum is σ = 22107852. Its totient is φ = 21381720.

The previous prime is 21741799. The next prime is 21741817. The reversal of 21741803 is 30814712.

It is not a de Polignac number, because 21741803 - 2² = 21741799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21741823) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 800 + ... + 6642.

It is an arithmetic number, because the mean of its divisors is an integer number (3684642).

Almost surely, 2^21741803 is an apocalyptic number.

21741803 is a deficient number, since it is larger than the sum of its proper divisors (366049).

21741803 is an frugal number, since it uses more digits than its factorization.

21741803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5965 (or 5904 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21741803 is about 4662.8106330839. The cubic root of 21741803 is about 279.1034375353.

The spelling of 21741803 in words is "twenty-one million, seven hundred forty-one thousand, eight hundred three".