231021102212261 has 2 divisors, whose sum is σ = 231021102212262. Its totient is φ = 231021102212260.

The previous prime is 231021102212179. The next prime is 231021102212273. The reversal of 231021102212261 is 162212201120132.

231021102212261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132402418890625 + 98618683321636 = 11506625^2 + 9930694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231021102212261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231021102212261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231021102212561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115510551106130 + 115510551106131.

It is an arithmetic number, because the mean of its divisors is an integer number (115510551106131).

Almost surely, 2^{231021102212261} is an apocalyptic number.

It is an amenable number.

231021102212261 is a deficient number, since it is larger than the sum of its proper divisors (1).

231021102212261 is an equidigital number, since it uses as much as digits as its factorization.

231021102212261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

Adding to 231021102212261 its reverse (162212201120132), we get a palindrome (393233303332393).

The spelling of 231021102212261 in words is "two hundred thirty-one trillion, twenty-one billion, one hundred two million, two hundred twelve thousand, two hundred sixty-one".