21112032321 has 16 divisors (see below), whose sum is σ = 31365702720. Its totient is φ = 14034810240.

The previous prime is 21112032311. The next prime is 21112032341. The reversal of 21112032321 is 12323021112.

It is not a de Polignac number, because 21112032321 - 2¹¹ = 21112030273 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21112032294 and 21112032303.

It is not an unprimeable number, because it can be changed into a prime (21112032311) 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, 1098015 + ... + 1117076.

It is an arithmetic number, because the mean of its divisors is an integer number (1960356420).

Almost surely, 2^21112032321 is an apocalyptic number.

It is an amenable number.

21112032321 is a deficient number, since it is larger than the sum of its proper divisors (10253670399).

21112032321 is a wasteful number, since it uses less digits than its factorization.

21112032321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215453 (or 2215447 counting only the distinct ones).

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

Adding to 21112032321 its reverse (12323021112), we get a palindrome (33435053433).

The spelling of 21112032321 in words is "twenty-one billion, one hundred twelve million, thirty-two thousand, three hundred twenty-one".