211021101001 has 2 divisors, whose sum is σ = 211021101002. Its totient is φ = 211021101000.

The previous prime is 211021100999. The next prime is 211021101089. The reversal of 211021101001 is 100101120112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191888678601 + 19132422400 = 438051^2 + 138320^2 .

It is a cyclic number.

It is not a de Polignac number, because 211021101001 - 2¹ = 211021100999 is a prime.

Together with 211021100999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (211021101301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510550500 + 105510550501.

It is an arithmetic number, because the mean of its divisors is an integer number (105510550501).

Almost surely, 2^211021101001 is an apocalyptic number.

It is an amenable number.

211021101001 is a deficient number, since it is larger than the sum of its proper divisors (1).

211021101001 is an equidigital number, since it uses as much as digits as its factorization.

211021101001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 211021101001 its reverse (100101120112), we get a palindrome (311122221113).

The spelling of 211021101001 in words is "two hundred eleven billion, twenty-one million, one hundred one thousand, one".