21000210044 has 24 divisors (see below), whose sum is σ = 40096425600. Its totient is φ = 9544332080.

The previous prime is 21000210037. The next prime is 21000210059. The reversal of 21000210044 is 44001200012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380687 + ... + 432345.

It is an arithmetic number, because the mean of its divisors is an integer number (1670684400).

Almost surely, 2^21000210044 is an apocalyptic number.

It is an amenable number.

21000210044 is a deficient number, since it is larger than the sum of its proper divisors (19096215556).

21000210044 is a wasteful number, since it uses less digits than its factorization.

21000210044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60913 (or 60911 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21000210044 its reverse (44001200012), we get a palindrome (65001410056).

The spelling of 21000210044 in words is "twenty-one billion, two hundred ten thousand, forty-four".