211221330101 has 2 divisors, whose sum is σ = 211221330102. Its totient is φ = 211221330100.

The previous prime is 211221330097. The next prime is 211221330127. The reversal of 211221330101 is 101033122112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209274226225 + 1947103876 = 457465^2 + 44126^2 .

It is a cyclic number.

It is not a de Polignac number, because 211221330101 - 2² = 211221330097 is a prime.

It is a super-3 number, since 3×211221330101³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 211221330101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211221330181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610665050 + 105610665051.

It is an arithmetic number, because the mean of its divisors is an integer number (105610665051).

Almost surely, 2^211221330101 is an apocalyptic number.

It is an amenable number.

211221330101 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221330101 is an equidigital number, since it uses as much as digits as its factorization.

211221330101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 211221330101 its reverse (101033122112), we get a palindrome (312254452213).

The spelling of 211221330101 in words is "two hundred eleven billion, two hundred twenty-one million, three hundred thirty thousand, one hundred one".