21001012002011 has 4 divisors (see below), whose sum is σ = 21003583457712. Its totient is φ = 20998440546312.

The previous prime is 21001012001989. The next prime is 21001012002013. The reversal of 21001012002011 is 11020021010012.

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 21001012002011 - 2¹⁰ = 21001012000987 is a prime.

It is a super-2 number, since 2×21001012002011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001012001983 and 21001012002001.

It is not an unprimeable number, because it can be changed into a prime (21001012002013) 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, 1285715600 + ... + 1285731933.

It is an arithmetic number, because the mean of its divisors is an integer number (5250895864428).

Almost surely, 2^{21001012002011} is an apocalyptic number.

21001012002011 is a deficient number, since it is larger than the sum of its proper divisors (2571455701).

21001012002011 is an equidigital number, since it uses as much as digits as its factorization.

21001012002011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571455700.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21001012002011 its reverse (11020021010012), we get a palindrome (32021033012023).

The spelling of 21001012002011 in words is "twenty-one trillion, one billion, twelve million, two thousand, eleven".