21012201020011 has 16 divisors (see below), whose sum is σ = 21105159742080. Its totient is φ = 20919467036160.

The previous prime is 21012201019987. The next prime is 21012201020029. The reversal of 21012201020011 is 11002010221012.

It is a cyclic number.

It is not a de Polignac number, because 21012201020011 - 2²¹ = 21012198922859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012201019973 and 21012201020000.

It is not an unprimeable number, because it can be changed into a prime (21012201020071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 531813525 + ... + 531853033.

It is an arithmetic number, because the mean of its divisors is an integer number (1319072483880).

Almost surely, 2^{21012201020011} is an apocalyptic number.

21012201020011 is a deficient number, since it is larger than the sum of its proper divisors (92958722069).

21012201020011 is a wasteful number, since it uses less digits than its factorization.

21012201020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42294.

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

Adding to 21012201020011 its reverse (11002010221012), we get a palindrome (32014211241023).

The spelling of 21012201020011 in words is "twenty-one trillion, twelve billion, two hundred one million, twenty thousand, eleven".