211021000021111 has 12 divisors (see below), whose sum is σ = 245473742449560. Its totient is φ = 180874896577200.

The previous prime is 211021000021103. The next prime is 211021000021157. The reversal of 211021000021111 is 111120000120112.

It is a happy number.

It is not a de Polignac number, because 211021000021111 - 2³ = 211021000021103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211021000021091 and 211021000021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211021000031111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39672580 + ... + 44676118.

It is an arithmetic number, because the mean of its divisors is an integer number (20456145204130).

Almost surely, 2^{211021000021111} is an apocalyptic number.

211021000021111 is a deficient number, since it is larger than the sum of its proper divisors (34452742428449).

211021000021111 is an equidigital number, since it uses as much as digits as its factorization.

211021000021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5864254 (or 5864247 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211021000021111 its reverse (111120000120112), we get a palindrome (322141000141223).

Subtracting from 211021000021111 its reverse (111120000120112), we obtain a palindrome (99900999900999).

The spelling of 211021000021111 in words is "two hundred eleven trillion, twenty-one billion, twenty-one thousand, one hundred eleven".