21000011201011 has 4 divisors (see below), whose sum is σ = 21139084123024. Its totient is φ = 20860938279000.

The previous prime is 21000011201009. The next prime is 21000011201023. The reversal of 21000011201011 is 11010211000012.

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 21000011201011 - 2¹ = 21000011201009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000011201041) 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, 69536460780 + ... + 69536461081.

It is an arithmetic number, because the mean of its divisors is an integer number (5284771030756).

Almost surely, 2^{21000011201011} is an apocalyptic number.

21000011201011 is a deficient number, since it is larger than the sum of its proper divisors (139072922013).

21000011201011 is a wasteful number, since it uses less digits than its factorization.

21000011201011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139072922012.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21000011201011 its reverse (11010211000012), we get a palindrome (32010222201023).

The spelling of 21000011201011 in words is "twenty-one trillion, eleven million, two hundred one thousand, eleven".