21102132321 has 24 divisors (see below), whose sum is σ = 30889863680. Its totient is φ = 13879584576.

The previous prime is 21102132319. The next prime is 21102132341. The reversal of 21102132321 is 12323120112.

21102132321 is a `hidden beast` number, since 211 + 0 + 2 + 132 + 321 = 666.

It is not a de Polignac number, because 21102132321 - 2¹ = 21102132319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102132294 and 21102132303.

It is not an unprimeable number, because it can be changed into a prime (21102132341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1001325 + ... + 1022181.

Almost surely, 2^21102132321 is an apocalyptic number.

It is an amenable number.

21102132321 is a deficient number, since it is larger than the sum of its proper divisors (9787731359).

21102132321 is a wasteful number, since it uses less digits than its factorization.

21102132321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22365 (or 22362 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21102132321 its reverse (12323120112), we get a palindrome (33425252433).

It can be divided in two parts, 211021 and 32321, that added together give a palindrome (243342).

The spelling of 21102132321 in words is "twenty-one billion, one hundred two million, one hundred thirty-two thousand, three hundred twenty-one".