211210011112021 has 4 divisors (see below), whose sum is σ = 218493114943500. Its totient is φ = 203926907280544.

The previous prime is 211210011112003. The next prime is 211210011112031. The reversal of 211210011112021 is 120211110012112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 180485494691121 + 30724516420900 = 13434489^2 + 5542970^2 .

It is a cyclic number.

It is not a de Polignac number, because 211210011112021 - 2¹¹ = 211210011109973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211210011111986 and 211210011112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210011112031) 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, 3641551915696 + ... + 3641551915753.

It is an arithmetic number, because the mean of its divisors is an integer number (54623278735875).

Almost surely, 2^{211210011112021} is an apocalyptic number.

It is an amenable number.

211210011112021 is a deficient number, since it is larger than the sum of its proper divisors (7283103831479).

211210011112021 is an equidigital number, since it uses as much as digits as its factorization.

211210011112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7283103831478.

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

Adding to 211210011112021 its reverse (120211110012112), we get a palindrome (331421121124133).

The spelling of 211210011112021 in words is "two hundred eleven trillion, two hundred ten billion, eleven million, one hundred twelve thousand, twenty-one".