21344042404 has 12 divisors (see below), whose sum is σ = 37353164800. Its totient is φ = 10671709608.

The previous prime is 21344042387. The next prime is 21344042411. The reversal of 21344042404 is 40424044312.

It is a super-2 number, since 2×21344042404² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150877 + ... + 255835.

Almost surely, 2^21344042404 is an apocalyptic number.

It is an amenable number.

21344042404 is a deficient number, since it is larger than the sum of its proper divisors (16009122396).

21344042404 is a wasteful number, since it uses less digits than its factorization.

21344042404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155802 (or 155800 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 21344042404 its reverse (40424044312), we get a palindrome (61768086716).

The spelling of 21344042404 in words is "twenty-one billion, three hundred forty-four million, forty-two thousand, four hundred four".