11212003261 has 2 divisors, whose sum is σ = 11212003262. Its totient is φ = 11212003260.

The previous prime is 11212003259. The next prime is 11212003321. The reversal of 11212003261 is 16230021211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7004016100 + 4207987161 = 83690^2 + 64869^2 .

It is an emirp because it is prime and its reverse (16230021211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11212003261 - 2¹ = 11212003259 is a prime.

Together with 11212003259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11212003211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606001630 + 5606001631.

It is an arithmetic number, because the mean of its divisors is an integer number (5606001631).

Almost surely, 2^11212003261 is an apocalyptic number.

It is an amenable number.

11212003261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11212003261 is an equidigital number, since it uses as much as digits as its factorization.

11212003261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 11212003261 its reverse (16230021211), we get a palindrome (27442024472).

The spelling of 11212003261 in words is "eleven billion, two hundred twelve million, three thousand, two hundred sixty-one".