21012120020011 has 8 divisors (see below), whose sum is σ = 21736737105120. Its totient is φ = 20287507016448.

The previous prime is 21012120020009. The next prime is 21012120020033. The reversal of 21012120020011 is 11002002121012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21012120020011 - 2¹ = 21012120020009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012120019973 and 21012120020000.

It is not an unprimeable number, because it can be changed into a prime (21012120020041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12481690 + ... + 14064736.

It is an arithmetic number, because the mean of its divisors is an integer number (2717092138140).

Almost surely, 2^{21012120020011} is an apocalyptic number.

21012120020011 is a deficient number, since it is larger than the sum of its proper divisors (724617085109).

21012120020011 is a wasteful number, since it uses less digits than its factorization.

21012120020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040773.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21012120020011 its reverse (11002002121012), we get a palindrome (32014122141023).

The spelling of 21012120020011 in words is "twenty-one trillion, twelve billion, one hundred twenty million, twenty thousand, eleven".