11451661221212 has 12 divisors (see below), whose sum is σ = 20042617458360. Its totient is φ = 5725199090256.

The previous prime is 11451661221211. The next prime is 11451661221233. The reversal of 11451661221212 is 21212216615411.

It is a super-2 number, since 2×11451661221212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11451661221211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157839287 + ... + 157911822.

It is an arithmetic number, because the mean of its divisors is an integer number (1670218121530).

Almost surely, 2^{11451661221212} is an apocalyptic number.

It is an amenable number.

11451661221212 is a deficient number, since it is larger than the sum of its proper divisors (8590956237148).

11451661221212 is a wasteful number, since it uses less digits than its factorization.

11451661221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315760180 (or 315760178 counting only the distinct ones).

The product of its digits is 11520, while the sum is 35.

Adding to 11451661221212 its reverse (21212216615411), we get a palindrome (32663877836623).

The spelling of 11451661221212 in words is "eleven trillion, four hundred fifty-one billion, six hundred sixty-one million, two hundred twenty-one thousand, two hundred twelve".