21611131322236 has 12 divisors (see below), whose sum is σ = 37822776858720. Its totient is φ = 10804623648320.

The previous prime is 21611131322203. The next prime is 21611131322273. The reversal of 21611131322236 is 63222313111612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235451581 + ... + 235543348.

It is an arithmetic number, because the mean of its divisors is an integer number (3151898071560).

Almost surely, 2^{21611131322236} is an apocalyptic number.

It is an amenable number.

21611131322236 is a deficient number, since it is larger than the sum of its proper divisors (16211645536484).

21611131322236 is a wasteful number, since it uses less digits than its factorization.

21611131322236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471006404 (or 471006402 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

Adding to 21611131322236 its reverse (63222313111612), we get a palindrome (84833444433848).

The spelling of 21611131322236 in words is "twenty-one trillion, six hundred eleven billion, one hundred thirty-one million, three hundred twenty-two thousand, two hundred thirty-six".