21102044104 has 16 divisors (see below), whose sum is σ = 41893764300. Its totient is φ = 9930373632.

The previous prime is 21102044101. The next prime is 21102044111. The reversal of 21102044104 is 40144020112.

It can be written as a sum of positive squares in 2 ways, for example, as 19113062500 + 1988981604 = 138250^2 + 44598^2 .

It is a super-2 number, since 2×21102044104² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21102044101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77580909 + ... + 77581180.

Almost surely, 2^21102044104 is an apocalyptic number.

It is an amenable number.

21102044104 is a deficient number, since it is larger than the sum of its proper divisors (20791720196).

21102044104 is a wasteful number, since it uses less digits than its factorization.

21102044104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155162112 (or 155162108 counting only the distinct ones).

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

Adding to 21102044104 its reverse (40144020112), we get a palindrome (61246064216).

The spelling of 21102044104 in words is "twenty-one billion, one hundred two million, forty-four thousand, one hundred four".