21202112321 has 8 divisors (see below), whose sum is σ = 22834312704. Its totient is φ = 19570093200.

The previous prime is 21202112311. The next prime is 21202112339. The reversal of 21202112321 is 12321120212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202112321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21202112321.

It is not an unprimeable number, because it can be changed into a prime (21202112311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289046 + ... + 354896.

It is an arithmetic number, because the mean of its divisors is an integer number (2854289088).

Almost surely, 2^21202112321 is an apocalyptic number.

It is an amenable number.

21202112321 is a deficient number, since it is larger than the sum of its proper divisors (1632200383).

21202112321 is a wasteful number, since it uses less digits than its factorization.

21202112321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90631.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21202112321 its reverse (12321120212), we get a palindrome (33523232533).

The spelling of 21202112321 in words is "twenty-one billion, two hundred two million, one hundred twelve thousand, three hundred twenty-one".