21003011013011 has 4 divisors (see below), whose sum is σ = 21347322669024. Its totient is φ = 20658699357000.

The previous prime is 21003011012999. The next prime is 21003011013053. The reversal of 21003011013011 is 11031011030012.

It is a happy number.

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 21003011013011 - 2⁶ = 21003011012947 is a prime.

It is a super-2 number, since 2×21003011013011² (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 (21003011013511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172155827915 + ... + 172155828036.

It is an arithmetic number, because the mean of its divisors is an integer number (5336830667256).

Almost surely, 2^{21003011013011} is an apocalyptic number.

21003011013011 is a deficient number, since it is larger than the sum of its proper divisors (344311656013).

21003011013011 is an equidigital number, since it uses as much as digits as its factorization.

21003011013011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344311656012.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 21003011013011 its reverse (11031011030012), we get a palindrome (32034022043023).

The spelling of 21003011013011 in words is "twenty-one trillion, three billion, eleven million, thirteen thousand, eleven".