21102041044 has 24 divisors (see below), whose sum is σ = 44686676160. Its totient is φ = 8511747456.

The previous prime is 21102041033. The next prime is 21102041057. The reversal of 21102041044 is 44014020112.

It is a super-2 number, since 2×21102041044² (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 7 ways as a sum of consecutive naturals, for example, 22165534 + ... + 22166485.

It is an arithmetic number, because the mean of its divisors is an integer number (1861944840).

Almost surely, 2^21102041044 is an apocalyptic number.

It is an amenable number.

21102041044 is an abundant number, since it is smaller than the sum of its proper divisors (23584635116).

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

21102041044 is a wasteful number, since it uses less digits than its factorization.

21102041044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44332047 (or 44332045 counting only the distinct ones).

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

Adding to 21102041044 its reverse (44014020112), we get a palindrome (65116061156).

The spelling of 21102041044 in words is "twenty-one billion, one hundred two million, forty-one thousand, forty-four".