211102021021 has 4 divisors (see below), whose sum is σ = 216250850844. Its totient is φ = 205953191200.

The previous prime is 211102020989. The next prime is 211102021033. The reversal of 211102021021 is 120120201112.

211102021021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 78030276921 + 133071744100 = 279339^2 + 364790^2 .

It is a cyclic number.

It is not a de Polignac number, because 211102021021 - 2⁵ = 211102020989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211102020992 and 211102021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211102021051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2574414850 + ... + 2574414931.

It is an arithmetic number, because the mean of its divisors is an integer number (54062712711).

Almost surely, 2^211102021021 is an apocalyptic number.

It is an amenable number.

211102021021 is a deficient number, since it is larger than the sum of its proper divisors (5148829823).

211102021021 is an equidigital number, since it uses as much as digits as its factorization.

211102021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5148829822.

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

Adding to 211102021021 its reverse (120120201112), we get a palindrome (331222222133).

The spelling of 211102021021 in words is "two hundred eleven billion, one hundred two million, twenty-one thousand, twenty-one".