21165411532 has 24 divisors (see below), whose sum is σ = 40684089600. Its totient is φ = 9589819536.

The previous prime is 21165411517. The next prime is 21165411571. The reversal of 21165411532 is 23511456112.

It is a junction number, because it is equal to n+sod(n) for n = 21165411494 and 21165411503.

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, 6052432 + ... + 6055927.

It is an arithmetic number, because the mean of its divisors is an integer number (1695170400).

Almost surely, 2^21165411532 is an apocalyptic number.

It is an amenable number.

21165411532 is a deficient number, since it is larger than the sum of its proper divisors (19518678068).

21165411532 is a wasteful number, since it uses less digits than its factorization.

21165411532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12108405 (or 12108403 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

Adding to 21165411532 its reverse (23511456112), we get a palindrome (44676867644).

The spelling of 21165411532 in words is "twenty-one billion, one hundred sixty-five million, four hundred eleven thousand, five hundred thirty-two".