21011320013203 has 32 divisors (see below), whose sum is σ = 23006920406400. Its totient is φ = 19071391825920.

The previous prime is 21011320013183. The next prime is 21011320013221. The reversal of 21011320013203 is 30231002311012.

It is a cyclic number.

It is not a de Polignac number, because 21011320013203 - 2⁹ = 21011320012691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011320013603) 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, 1150854651 + ... + 1150872907.

It is an arithmetic number, because the mean of its divisors is an integer number (718966262700).

Almost surely, 2^{21011320013203} is an apocalyptic number.

21011320013203 is a deficient number, since it is larger than the sum of its proper divisors (1995600393197).

21011320013203 is a wasteful number, since it uses less digits than its factorization.

21011320013203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21567.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21011320013203 its reverse (30231002311012), we get a palindrome (51242322324215).

The spelling of 21011320013203 in words is "twenty-one trillion, eleven billion, three hundred twenty million, thirteen thousand, two hundred three".