21419799 has 4 divisors (see below), whose sum is σ = 28559736. Its totient is φ = 14279864.

The previous prime is 21419789. The next prime is 21419807. The reversal of 21419799 is 99791412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21419799 - 2⁵ = 21419767 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21419799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21419759) 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, 3569964 + ... + 3569969.

It is an arithmetic number, because the mean of its divisors is an integer number (7139934).

Almost surely, 2^21419799 is an apocalyptic number.

21419799 is a deficient number, since it is larger than the sum of its proper divisors (7139937).

21419799 is an equidigital number, since it uses as much as digits as its factorization.

21419799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7139936.

The product of its digits is 40824, while the sum is 42.

The square root of 21419799 is about 4628.1528712868. The cubic root of 21419799 is about 277.7187043032.

The spelling of 21419799 in words is "twenty-one million, four hundred nineteen thousand, seven hundred ninety-nine".