21441799 has 4 divisors (see below), whose sum is σ = 21453736. Its totient is φ = 21429864.

The previous prime is 21441769. The next prime is 21441857. The reversal of 21441799 is 99714412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21441799 - 2²³ = 13053191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441769) 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, 2664 + ... + 7069.

It is an arithmetic number, because the mean of its divisors is an integer number (5363434).

Almost surely, 2^21441799 is an apocalyptic number.

21441799 is a deficient number, since it is larger than the sum of its proper divisors (11937).

21441799 is an equidigital number, since it uses as much as digits as its factorization.

21441799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11936.

The product of its digits is 18144, while the sum is 37.

The square root of 21441799 is about 4630.5290194534. The cubic root of 21441799 is about 277.8137522060.

The spelling of 21441799 in words is "twenty-one million, four hundred forty-one thousand, seven hundred ninety-nine".