21121110044 has 48 divisors (see below), whose sum is σ = 38654098560. Its totient is φ = 10087963200.

The previous prime is 21121110041. The next prime is 21121110161. The reversal of 21121110044 is 44001112112.

It is a super-2 number, since 2×21121110044² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121110041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12669299 + ... + 12670965.

It is an arithmetic number, because the mean of its divisors is an integer number (805293720).

Almost surely, 2^21121110044 is an apocalyptic number.

It is an amenable number.

21121110044 is a deficient number, since it is larger than the sum of its proper divisors (17532988516).

21121110044 is a wasteful number, since it uses less digits than its factorization.

21121110044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3218 (or 3216 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21121110044 its reverse (44001112112), we get a palindrome (65122222156).

The spelling of 21121110044 in words is "twenty-one billion, one hundred twenty-one million, one hundred ten thousand, forty-four".