21002011320203 has 4 divisors (see below), whose sum is σ = 21002338911288. Its totient is φ = 21001683729120.

The previous prime is 21002011320179. The next prime is 21002011320209. The reversal of 21002011320203 is 30202311020012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21002011320203 - 2¹⁸ = 21002011058059 is a prime.

It is a super-2 number, since 2×21002011320203² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002011320209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163699358 + ... + 163827603.

It is an arithmetic number, because the mean of its divisors is an integer number (5250584727822).

Almost surely, 2^{21002011320203} is an apocalyptic number.

21002011320203 is a deficient number, since it is larger than the sum of its proper divisors (327591085).

21002011320203 is an equidigital number, since it uses as much as digits as its factorization.

21002011320203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327591084.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21002011320203 its reverse (30202311020012), we get a palindrome (51204322340215).

The spelling of 21002011320203 in words is "twenty-one trillion, two billion, eleven million, three hundred twenty thousand, two hundred three".