21241983 has 16 divisors (see below), whose sum is σ = 32438016. Its totient is φ = 12112320.

The previous prime is 21241973. The next prime is 21241991. The reversal of 21241983 is 38914212.

It is not a de Polignac number, because 21241983 - 2⁴ = 21241967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21241983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241963) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13603 + ... + 15083.

It is an arithmetic number, because the mean of its divisors is an integer number (2027376).

Almost surely, 2^21241983 is an apocalyptic number.

21241983 is a deficient number, since it is larger than the sum of its proper divisors (11196033).

21241983 is a wasteful number, since it uses less digits than its factorization.

21241983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174.

The product of its digits is 3456, while the sum is 30.

The square root of 21241983 is about 4608.9025808754. The cubic root of 21241983 is about 276.9480759542.

It can be divided in two parts, 212 and 41983, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 21241983 in words is "twenty-one million, two hundred forty-one thousand, nine hundred eighty-three".