21766041 has 24 divisors (see below), whose sum is σ = 35102496. Its totient is φ = 12882240.

The previous prime is 21766033. The next prime is 21766049. The reversal of 21766041 is 14066712.

It is an interprime number because it is at equal distance from previous prime (21766033) and next prime (21766049).

It is not a de Polignac number, because 21766041 - 2³ = 21766033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21765996 and 21766014.

It is not an unprimeable number, because it can be changed into a prime (21766049) 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 23 ways as a sum of consecutive naturals, for example, 1701 + ... + 6813.

It is an arithmetic number, because the mean of its divisors is an integer number (1462604).

Almost surely, 2^21766041 is an apocalyptic number.

It is an amenable number.

21766041 is a deficient number, since it is larger than the sum of its proper divisors (13336455).

21766041 is a wasteful number, since it uses less digits than its factorization.

21766041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5173 (or 5170 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21766041 is about 4665.4089852874. The cubic root of 21766041 is about 279.2071148738.

The spelling of 21766041 in words is "twenty-one million, seven hundred sixty-six thousand, forty-one".