11451661221213 has 48 divisors (see below), whose sum is σ = 17269709483520. Its totient is φ = 7303158922752.

The previous prime is 11451661221211. The next prime is 11451661221233. The reversal of 11451661221213 is 31212216615411.

11451661221213 is a `hidden beast` number, since 1 + 1 + 4 + 5 + 1 + 6 + 612 + 21 + 2 + 13 = 666.

It is not a de Polignac number, because 11451661221213 - 2¹ = 11451661221211 is a prime.

It is a super-2 number, since 2×11451661221213² (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 polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78466956 + ... + 78612762.

It is an arithmetic number, because the mean of its divisors is an integer number (359785614240).

Almost surely, 2^{11451661221213} is an apocalyptic number.

It is an amenable number.

11451661221213 is a deficient number, since it is larger than the sum of its proper divisors (5818048262307).

11451661221213 is a wasteful number, since it uses less digits than its factorization.

11451661221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148618 (or 148615 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

Adding to 11451661221213 its reverse (31212216615411), we get a palindrome (42663877836624).

The spelling of 11451661221213 in words is "eleven trillion, four hundred fifty-one billion, six hundred sixty-one million, two hundred twenty-one thousand, two hundred thirteen".