21799463 has 6 divisors (see below), whose sum is σ = 25358616. Its totient is φ = 18685212.

The previous prime is 21799447. The next prime is 21799487. The reversal of 21799463 is 36499712.

It is not a de Polignac number, because 21799463 - 2⁴ = 21799447 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 21799463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21799363) 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 5 ways as a sum of consecutive naturals, for example, 222395 + ... + 222492.

It is an arithmetic number, because the mean of its divisors is an integer number (4226436).

Almost surely, 2^21799463 is an apocalyptic number.

21799463 is a deficient number, since it is larger than the sum of its proper divisors (3559153).

21799463 is an equidigital number, since it uses as much as digits as its factorization.

21799463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444901 (or 444894 counting only the distinct ones).

The product of its digits is 81648, while the sum is 41.

The square root of 21799463 is about 4668.9895052356. The cubic root of 21799463 is about 279.3499503421.

The spelling of 21799463 in words is "twenty-one million, seven hundred ninety-nine thousand, four hundred sixty-three".