21404044120 has 32 divisors (see below), whose sum is σ = 48203259120. Its totient is φ = 8553767040.

The previous prime is 21404044097. The next prime is 21404044121. The reversal of 21404044120 is 2144040412.

It is a junction number, because it is equal to n+sod(n) for n = 21404044091 and 21404044100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404044121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201066 + ... + 288505.

Almost surely, 2^21404044120 is an apocalyptic number.

21404044120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21404044120 is an abundant number, since it is smaller than the sum of its proper divisors (26799215000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21404044120 is a wasteful number, since it uses less digits than its factorization.

21404044120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490675 (or 490671 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21404044120 its reverse (2144040412), we get a palindrome (23548084532).

The spelling of 21404044120 in words is "twenty-one billion, four hundred four million, forty-four thousand, one hundred twenty".