11451661221211 has 2 divisors, whose sum is σ = 11451661221212. Its totient is φ = 11451661221210.

The previous prime is 11451661221197. The next prime is 11451661221233. The reversal of 11451661221211 is 11212216615411.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11451661221211 - 2¹³ = 11451661213019 is a prime.

It is a super-2 number, since 2×11451661221211² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11451661227211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5725830610605 + 5725830610606.

It is an arithmetic number, because the mean of its divisors is an integer number (5725830610606).

Almost surely, 2^{11451661221211} is an apocalyptic number.

11451661221211 is a deficient number, since it is larger than the sum of its proper divisors (1).

11451661221211 is an equidigital number, since it uses as much as digits as its factorization.

11451661221211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 34.

Adding to 11451661221211 its reverse (11212216615411), we get a palindrome (22663877836622).

The spelling of 11451661221211 in words is "eleven trillion, four hundred fifty-one billion, six hundred sixty-one million, two hundred twenty-one thousand, two hundred eleven".