211021220101 has 2 divisors, whose sum is σ = 211021220102. Its totient is φ = 211021220100.

The previous prime is 211021220093. The next prime is 211021220117. The reversal of 211021220101 is 101022120112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129690735876 + 81330484225 = 360126^2 + 285185^2 .

It is a cyclic number.

It is not a de Polignac number, because 211021220101 - 2³ = 211021220093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211021220161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510610050 + 105510610051.

It is an arithmetic number, because the mean of its divisors is an integer number (105510610051).

Almost surely, 2^211021220101 is an apocalyptic number.

It is an amenable number.

211021220101 is a deficient number, since it is larger than the sum of its proper divisors (1).

211021220101 is an equidigital number, since it uses as much as digits as its factorization.

211021220101 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 13.

Adding to 211021220101 its reverse (101022120112), we get a palindrome (312043340213).

The spelling of 211021220101 in words is "two hundred eleven billion, twenty-one million, two hundred twenty thousand, one hundred one".