21763841 has 4 divisors (see below), whose sum is σ = 23742384. Its totient is φ = 19785300.

The previous prime is 21763823. The next prime is 21763849. The reversal of 21763841 is 14836712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21763841 - 2¹⁰ = 21762817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21763798 and 21763807.

It is not an unprimeable number, because it can be changed into a prime (21763849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 989255 + ... + 989276.

It is an arithmetic number, because the mean of its divisors is an integer number (5935596).

Almost surely, 2^21763841 is an apocalyptic number.

It is an amenable number.

21763841 is a deficient number, since it is larger than the sum of its proper divisors (1978543).

21763841 is a wasteful number, since it uses less digits than its factorization.

21763841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978542.

The product of its digits is 8064, while the sum is 32.

The square root of 21763841 is about 4665.1732015007. The cubic root of 21763841 is about 279.1977076149.

The spelling of 21763841 in words is "twenty-one million, seven hundred sixty-three thousand, eight hundred forty-one".