211332310261 has 2 divisors, whose sum is σ = 211332310262. Its totient is φ = 211332310260.

The previous prime is 211332310223. The next prime is 211332310271. The reversal of 211332310261 is 162013233112.

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., 211259736900 + 72573361 = 459630^2 + 8519^2 .

It is a cyclic number.

It is not a de Polignac number, because 211332310261 - 2²¹ = 211330213109 is a prime.

It is a super-2 number, since 2×211332310261² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211332310201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105666155130 + 105666155131.

It is an arithmetic number, because the mean of its divisors is an integer number (105666155131).

Almost surely, 2^211332310261 is an apocalyptic number.

It is an amenable number.

211332310261 is a deficient number, since it is larger than the sum of its proper divisors (1).

211332310261 is an equidigital number, since it uses as much as digits as its factorization.

211332310261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 211332310261 its reverse (162013233112), we get a palindrome (373345543373).

The spelling of 211332310261 in words is "two hundred eleven billion, three hundred thirty-two million, three hundred ten thousand, two hundred sixty-one".