211220321233 has 2 divisors, whose sum is σ = 211220321234. Its totient is φ = 211220321232.

The previous prime is 211220321203. The next prime is 211220321251. The reversal of 211220321233 is 332123022112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188211071889 + 23009249344 = 433833^2 + 151688^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220321233 - 2¹³ = 211220313041 is a prime.

It is a super-2 number, since 2×211220321233² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211220321203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610160616 + 105610160617.

It is an arithmetic number, because the mean of its divisors is an integer number (105610160617).

Almost surely, 2^211220321233 is an apocalyptic number.

It is an amenable number.

211220321233 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220321233 is an equidigital number, since it uses as much as digits as its factorization.

211220321233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 211220321233 its reverse (332123022112), we get a palindrome (543343343345).

The spelling of 211220321233 in words is "two hundred eleven billion, two hundred twenty million, three hundred twenty-one thousand, two hundred thirty-three".