21763842 has 32 divisors (see below), whose sum is σ = 48097152. Its totient is φ = 6530304.

The previous prime is 21763823. The next prime is 21763849. The reversal of 21763842 is 24836712.

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 15 ways as a sum of consecutive naturals, for example, 2293 + ... + 6984.

It is an arithmetic number, because the mean of its divisors is an integer number (1503036).

Almost surely, 2^21763842 is an apocalyptic number.

21763842 is an abundant number, since it is smaller than the sum of its proper divisors (26333310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21763842 is a wasteful number, since it uses less digits than its factorization.

21763842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9322.

The product of its digits is 16128, while the sum is 33.

The square root of 21763842 is about 4665.1733086778. The cubic root of 21763842 is about 279.1977118911.

The spelling of 21763842 in words is "twenty-one million, seven hundred sixty-three thousand, eight hundred forty-two".