211112011021 has 2 divisors, whose sum is σ = 211112011022. Its totient is φ = 211112011020.

The previous prime is 211112010997. The next prime is 211112011049. The reversal of 211112011021 is 120110211112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159464448900 + 51647562121 = 399330^2 + 227261^2 .

It is a cyclic number.

It is not a de Polignac number, because 211112011021 - 2⁹ = 211112010509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211112010992 and 211112011010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211112011091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105556005510 + 105556005511.

It is an arithmetic number, because the mean of its divisors is an integer number (105556005511).

Almost surely, 2^211112011021 is an apocalyptic number.

It is an amenable number.

211112011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211112011021 is an equidigital number, since it uses as much as digits as its factorization.

211112011021 is an evil number, because the sum of its binary digits is even.

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

Adding to 211112011021 its reverse (120110211112), we get a palindrome (331222222133).

The spelling of 211112011021 in words is "two hundred eleven billion, one hundred twelve million, eleven thousand, twenty-one".