21873063 has 8 divisors (see below), whose sum is σ = 29563888. Its totient is φ = 14382144.

The previous prime is 21873053. The next prime is 21873077. The reversal of 21873063 is 36037812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21873063 - 2²⁴ = 5095847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21873063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21873043) 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 7 ways as a sum of consecutive naturals, for example, 49720 + ... + 50157.

It is an arithmetic number, because the mean of its divisors is an integer number (3695486).

Almost surely, 2^21873063 is an apocalyptic number.

21873063 is a deficient number, since it is larger than the sum of its proper divisors (7690825).

21873063 is an equidigital number, since it uses as much as digits as its factorization.

21873063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99953.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21873063 is about 4676.8646548730. The cubic root of 21873063 is about 279.6639804177.

The spelling of 21873063 in words is "twenty-one million, eight hundred seventy-three thousand, sixty-three".