21202011321 has 32 divisors (see below), whose sum is σ = 29305113600. Its totient is φ = 13624459200.

The previous prime is 21202011287. The next prime is 21202011343. The reversal of 21202011321 is 12311020212.

It is not a de Polignac number, because 21202011321 - 2¹⁹ = 21201487033 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21202011321.

It is not an unprimeable number, because it can be changed into a prime (21202011361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7021350 + ... + 7024368.

It is an arithmetic number, because the mean of its divisors is an integer number (915784800).

Almost surely, 2^21202011321 is an apocalyptic number.

It is an amenable number.

21202011321 is a deficient number, since it is larger than the sum of its proper divisors (8103102279).

21202011321 is a wasteful number, since it uses less digits than its factorization.

21202011321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3629.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21202011321 its reverse (12311020212), we get a palindrome (33513031533).

The spelling of 21202011321 in words is "twenty-one billion, two hundred two million, eleven thousand, three hundred twenty-one".