211110021021 has 4 divisors (see below), whose sum is σ = 281480028032. Its totient is φ = 140740014012.

The previous prime is 211110020999. The next prime is 211110021077. The reversal of 211110021021 is 120120011112.

211110021021 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 211110021021 - 2⁷ = 211110020893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211110020988 and 211110021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211110521021) 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, 35185003501 + ... + 35185003506.

It is an arithmetic number, because the mean of its divisors is an integer number (70370007008).

Almost surely, 2^211110021021 is an apocalyptic number.

It is an amenable number.

211110021021 is a deficient number, since it is larger than the sum of its proper divisors (70370007011).

211110021021 is an equidigital number, since it uses as much as digits as its factorization.

211110021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70370007010.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 211110021021 its reverse (120120011112), we get a palindrome (331230032133).

Subtracting from 211110021021 its reverse (120120011112), we obtain a palindrome (90990009909).

The spelling of 211110021021 in words is "two hundred eleven billion, one hundred ten million, twenty-one thousand, twenty-one".