21042404219 has 4 divisors (see below), whose sum is σ = 21120629040. Its totient is φ = 20964179400.

The previous prime is 21042404203. The next prime is 21042404231. The reversal of 21042404219 is 91240424012.

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 21042404219 - 2⁴ = 21042404203 is a prime.

It is a super-2 number, since 2×21042404219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21042404191 and 21042404200.

It is not an unprimeable number, because it can be changed into a prime (21042404419) 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, 39112007 + ... + 39112544.

It is an arithmetic number, because the mean of its divisors is an integer number (5280157260).

Almost surely, 2^21042404219 is an apocalyptic number.

21042404219 is a deficient number, since it is larger than the sum of its proper divisors (78224821).

21042404219 is an equidigital number, since it uses as much as digits as its factorization.

21042404219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78224820.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 21042404219 in words is "twenty-one billion, forty-two million, four hundred four thousand, two hundred nineteen".