21401101044 has 30 divisors (see below), whose sum is σ = 55946706354. Its totient is φ = 7133700240.

The previous prime is 21401101013. The next prime is 21401101063. The reversal of 21401101044 is 44010110412.

It can be written as a sum of positive squares in only one way, i.e., 19737440100 + 1663660944 = 140490^2 + 40788^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 33026067 + ... + 33026714.

Almost surely, 2^21401101044 is an apocalyptic number.

It is an amenable number.

21401101044 is an abundant number, since it is smaller than the sum of its proper divisors (34545605310).

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

21401101044 is a wasteful number, since it uses less digits than its factorization.

21401101044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66052797 (or 66052786 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21401101044 its reverse (44010110412), we get a palindrome (65411211456).

The spelling of 21401101044 in words is "twenty-one billion, four hundred one million, one hundred one thousand, forty-four".