13211021261 has 2 divisors, whose sum is σ = 13211021262. Its totient is φ = 13211021260.

The previous prime is 13211021251. The next prime is 13211021303. The reversal of 13211021261 is 16212011231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12784598761 + 426422500 = 113069^2 + 20650^2 .

It is a cyclic number.

It is not a de Polignac number, because 13211021261 - 2²² = 13206826957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13211021251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6605510630 + 6605510631.

It is an arithmetic number, because the mean of its divisors is an integer number (6605510631).

Almost surely, 2^13211021261 is an apocalyptic number.

It is an amenable number.

13211021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13211021261 is an equidigital number, since it uses as much as digits as its factorization.

13211021261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 13211021261 its reverse (16212011231), we get a palindrome (29423032492).

The spelling of 13211021261 in words is "thirteen billion, two hundred eleven million, twenty-one thousand, two hundred sixty-one".