211020211021 has 16 divisors (see below), whose sum is σ = 214254511744. Its totient is φ = 207810054144.

The previous prime is 211020211001. The next prime is 211020211027. The reversal of 211020211021 is 120112020112.

It is a cyclic number.

It is not a de Polignac number, because 211020211021 - 2⁹ = 211020210509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211020210992 and 211020211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020211027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17090176 + ... + 17102518.

It is an arithmetic number, because the mean of its divisors is an integer number (13390906984).

Almost surely, 2^211020211021 is an apocalyptic number.

It is an amenable number.

211020211021 is a deficient number, since it is larger than the sum of its proper divisors (3234300723).

211020211021 is a wasteful number, since it uses less digits than its factorization.

211020211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13300.

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

Adding to 211020211021 its reverse (120112020112), we get a palindrome (331132231133).

The spelling of 211020211021 in words is "two hundred eleven billion, twenty million, two hundred eleven thousand, twenty-one".