211121021101 has 2 divisors, whose sum is σ = 211121021102. Its totient is φ = 211121021100.

The previous prime is 211121021063. The next prime is 211121021107. The reversal of 211121021101 is 101120121112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109659660201 + 101461360900 = 331149^2 + 318530^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121021101 - 2¹³ = 211121012909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211121021107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560510550 + 105560510551.

It is an arithmetic number, because the mean of its divisors is an integer number (105560510551).

Almost surely, 2^211121021101 is an apocalyptic number.

It is an amenable number.

211121021101 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121021101 is an equidigital number, since it uses as much as digits as its factorization.

211121021101 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 211121021101 its reverse (101120121112), we get a palindrome (312241142213).

The spelling of 211121021101 in words is "two hundred eleven billion, one hundred twenty-one million, twenty-one thousand, one hundred one".