1216454301121 has 4 divisors (see below), whose sum is σ = 1220845833172. Its totient is φ = 1212062769072.

The previous prime is 1216454301107. The next prime is 1216454301133. The reversal of 1216454301121 is 1211034546121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 723629240896 + 492825060225 = 850664^2 + 702015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216454301121 - 2¹³ = 1216454292929 is a prime.

It is a super-2 number, since 2×1216454301121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216454301151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2195765610 + ... + 2195766163.

It is an arithmetic number, because the mean of its divisors is an integer number (305211458293).

Almost surely, 2^{1216454301121} is an apocalyptic number.

It is an amenable number.

1216454301121 is a deficient number, since it is larger than the sum of its proper divisors (4391532051).

1216454301121 is an equidigital number, since it uses as much as digits as its factorization.

1216454301121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4391532050.

The product of its (nonzero) digits is 5760, while the sum is 31.

Adding to 1216454301121 its reverse (1211034546121), we get a palindrome (2427488847242).

The spelling of 1216454301121 in words is "one trillion, two hundred sixteen billion, four hundred fifty-four million, three hundred one thousand, one hundred twenty-one".