21001120012011 has 16 divisors (see below), whose sum is σ = 28592265822624. Its totient is φ = 13708160308224.

The previous prime is 21001120012001. The next prime is 21001120012039. The reversal of 21001120012011 is 11021002110012.

It is not a de Polignac number, because 21001120012011 - 2⁶ = 21001120011947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001120012001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349953666 + ... + 350013671.

It is an arithmetic number, because the mean of its divisors is an integer number (1787016613914).

Almost surely, 2^{21001120012011} is an apocalyptic number.

21001120012011 is a deficient number, since it is larger than the sum of its proper divisors (7591145810613).

21001120012011 is a wasteful number, since it uses less digits than its factorization.

21001120012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699967550.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001120012011 its reverse (11021002110012), we get a palindrome (32022122122023).

The spelling of 21001120012011 in words is "twenty-one trillion, one billion, one hundred twenty million, twelve thousand, eleven".