21200013321 has 16 divisors (see below), whose sum is σ = 29398137600. Its totient is φ = 13577286528.

The previous prime is 21200013313. The next prime is 21200013337. The reversal of 21200013321 is 12331000212.

It is not a de Polignac number, because 21200013321 - 2³ = 21200013313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21200013321.

It is not an unprimeable number, because it can be changed into a prime (21200012321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1200036 + ... + 1217573.

It is an arithmetic number, because the mean of its divisors is an integer number (1837383600).

Almost surely, 2^21200013321 is an apocalyptic number.

It is an amenable number.

21200013321 is a deficient number, since it is larger than the sum of its proper divisors (8198124279).

21200013321 is a wasteful number, since it uses less digits than its factorization.

21200013321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2417728.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21200013321 its reverse (12331000212), we get a palindrome (33531013533).

The spelling of 21200013321 in words is "twenty-one billion, two hundred million, thirteen thousand, three hundred twenty-one".