11211321361 has 2 divisors, whose sum is σ = 11211321362. Its totient is φ = 11211321360.

The previous prime is 11211321353. The next prime is 11211321379. The reversal of 11211321361 is 16312311211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6879707136 + 4331614225 = 82944^2 + 65815^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211321361 - 2³ = 11211321353 is a prime.

It is a super-2 number, since 2×11211321361² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11211321061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605660680 + 5605660681.

It is an arithmetic number, because the mean of its divisors is an integer number (5605660681).

Almost surely, 2^11211321361 is an apocalyptic number.

It is an amenable number.

11211321361 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211321361 is an equidigital number, since it uses as much as digits as its factorization.

11211321361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 22.

Adding to 11211321361 its reverse (16312311211), we get a palindrome (27523632572).

The spelling of 11211321361 in words is "eleven billion, two hundred eleven million, three hundred twenty-one thousand, three hundred sixty-one".