21111571144 has 16 divisors (see below), whose sum is σ = 40861105920. Its totient is φ = 10215276240.

The previous prime is 21111571141. The next prime is 21111571163. The reversal of 21111571144 is 44117511112.

It is not an unprimeable number, because it can be changed into a prime (21111571141) 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, 42563404 + ... + 42563899.

It is an arithmetic number, because the mean of its divisors is an integer number (2553819120).

Almost surely, 2^21111571144 is an apocalyptic number.

It is an amenable number.

21111571144 is a deficient number, since it is larger than the sum of its proper divisors (19749534776).

21111571144 is a wasteful number, since it uses less digits than its factorization.

21111571144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85127340 (or 85127336 counting only the distinct ones).

The product of its digits is 1120, while the sum is 28.

The spelling of 21111571144 in words is "twenty-one billion, one hundred eleven million, five hundred seventy-one thousand, one hundred forty-four".