211120010021 has 4 divisors (see below), whose sum is σ = 211120944972. Its totient is φ = 211119075072.

The previous prime is 211120010011. The next prime is 211120010039. The reversal of 211120010021 is 120010021112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 82751152225 + 128368857796 = 287665^2 + 358286^2 .

It is a cyclic number.

It is not a de Polignac number, because 211120010021 - 2³⁰ = 210046268197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211120009984 and 211120010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211120010011) 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, 104591 + ... + 658163.

It is an arithmetic number, because the mean of its divisors is an integer number (52780236243).

Almost surely, 2^211120010021 is an apocalyptic number.

It is an amenable number.

211120010021 is a deficient number, since it is larger than the sum of its proper divisors (934951).

211120010021 is an equidigital number, since it uses as much as digits as its factorization.

211120010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934950.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 211120010021 its reverse (120010021112), we get a palindrome (331130031133).

The spelling of 211120010021 in words is "two hundred eleven billion, one hundred twenty million, ten thousand, twenty-one".