212303120261 has 2 divisors, whose sum is σ = 212303120262. Its totient is φ = 212303120260.

The previous prime is 212303120257. The next prime is 212303120269. The reversal of 212303120261 is 162021303212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198265372900 + 14037747361 = 445270^2 + 118481^2 .

It is a cyclic number.

It is not a de Polignac number, because 212303120261 - 2² = 212303120257 is a prime.

It is a super-2 number, since 2×212303120261² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212303120269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106151560130 + 106151560131.

It is an arithmetic number, because the mean of its divisors is an integer number (106151560131).

Almost surely, 2^212303120261 is an apocalyptic number.

It is an amenable number.

212303120261 is a deficient number, since it is larger than the sum of its proper divisors (1).

212303120261 is an equidigital number, since it uses as much as digits as its factorization.

212303120261 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 23.

Adding to 212303120261 its reverse (162021303212), we get a palindrome (374324423473).

The spelling of 212303120261 in words is "two hundred twelve billion, three hundred three million, one hundred twenty thousand, two hundred sixty-one".