21204110044 has 48 divisors (see below), whose sum is σ = 42485954112. Its totient is φ = 9184361472.

The previous prime is 21204110009. The next prime is 21204110051. The reversal of 21204110044 is 44001140212.

It is a super-2 number, since 2×21204110044² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103869 + ... + 230644.

It is an arithmetic number, because the mean of its divisors is an integer number (885124044).

Almost surely, 2^21204110044 is an apocalyptic number.

It is an amenable number.

21204110044 is an abundant number, since it is smaller than the sum of its proper divisors (21281844068).

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

21204110044 is a wasteful number, since it uses less digits than its factorization.

21204110044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334606 (or 334604 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21204110044 its reverse (44001140212), we get a palindrome (65205250256).

The spelling of 21204110044 in words is "twenty-one billion, two hundred four million, one hundred ten thousand, forty-four".