211120200821 has 2 divisors, whose sum is σ = 211120200822. Its totient is φ = 211120200820.

The previous prime is 211120200817. The next prime is 211120200827. The reversal of 211120200821 is 128002021112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140516271025 + 70603929796 = 374855^2 + 265714^2 .

It is a cyclic number.

It is not a de Polignac number, because 211120200821 - 2² = 211120200817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211120200793 and 211120200802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211120200827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560100410 + 105560100411.

It is an arithmetic number, because the mean of its divisors is an integer number (105560100411).

Almost surely, 2^211120200821 is an apocalyptic number.

It is an amenable number.

211120200821 is a deficient number, since it is larger than the sum of its proper divisors (1).

211120200821 is an equidigital number, since it uses as much as digits as its factorization.

211120200821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211120200821 its reverse (128002021112), we get a palindrome (339122221933).

The spelling of 211120200821 in words is "two hundred eleven billion, one hundred twenty million, two hundred thousand, eight hundred twenty-one".