21419819 has 4 divisors (see below), whose sum is σ = 21516096. Its totient is φ = 21323544.

The previous prime is 21419807. The next prime is 21419837. The reversal of 21419819 is 91891412.

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 21419819 - 2²⁰ = 20371243 is a prime.

It is a super-2 number, since 2×21419819² = 917617291985522, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21419899) 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, 47804 + ... + 48249.

It is an arithmetic number, because the mean of its divisors is an integer number (5379024).

Almost surely, 2^21419819 is an apocalyptic number.

21419819 is a deficient number, since it is larger than the sum of its proper divisors (96277).

21419819 is an equidigital number, since it uses as much as digits as its factorization.

21419819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96276.

The product of its digits is 5184, while the sum is 35.

The square root of 21419819 is about 4628.1550319755. The cubic root of 21419819 is about 277.7187907400.

The spelling of 21419819 in words is "twenty-one million, four hundred nineteen thousand, eight hundred nineteen".