211120211111021 has 2 divisors, whose sum is σ = 211120211111022. Its totient is φ = 211120211111020.

The previous prime is 211120211110999. The next prime is 211120211111059. The reversal of 211120211111021 is 120111112021112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126508820692996 + 84611390418025 = 11247614^2 + 9198445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211120211111021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211120211111071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560105555510 + 105560105555511.

It is an arithmetic number, because the mean of its divisors is an integer number (105560105555511).

Almost surely, 2^{211120211111021} is an apocalyptic number.

It is an amenable number.

211120211111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211120211111021 is an equidigital number, since it uses as much as digits as its factorization.

211120211111021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 211120211111021 its reverse (120111112021112), we get a palindrome (331231323132133).

The spelling of 211120211111021 in words is "two hundred eleven trillion, one hundred twenty billion, two hundred eleven million, one hundred eleven thousand, twenty-one".