212231110021261 has 2 divisors, whose sum is σ = 212231110021262. Its totient is φ = 212231110021260.

The previous prime is 212231110021237. The next prime is 212231110021291. The reversal of 212231110021261 is 162120011132212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118744739764036 + 93486370257225 = 10897006^2 + 9668835^2 .

It is a cyclic number.

It is not a de Polignac number, because 212231110021261 - 2¹¹ = 212231110019213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212231110021291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106115555010630 + 106115555010631.

It is an arithmetic number, because the mean of its divisors is an integer number (106115555010631).

Almost surely, 2^{212231110021261} is an apocalyptic number.

It is an amenable number.

212231110021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

212231110021261 is an equidigital number, since it uses as much as digits as its factorization.

212231110021261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 212231110021261 its reverse (162120011132212), we get a palindrome (374351121153473).

The spelling of 212231110021261 in words is "two hundred twelve trillion, two hundred thirty-one billion, one hundred ten million, twenty-one thousand, two hundred sixty-one".