1243014552121 has 4 divisors (see below), whose sum is σ = 1266467656932. Its totient is φ = 1219561447312.

The previous prime is 1243014552119. The next prime is 1243014552209. The reversal of 1243014552121 is 1212554103421.

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 558291401721 + 684723150400 = 747189^2 + 827480^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243014552121 - 2¹ = 1243014552119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243014552421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11726552326 + ... + 11726552431.

It is an arithmetic number, because the mean of its divisors is an integer number (316616914233).

Almost surely, 2^{1243014552121} is an apocalyptic number.

It is an amenable number.

1243014552121 is a deficient number, since it is larger than the sum of its proper divisors (23453104811).

1243014552121 is an equidigital number, since it uses as much as digits as its factorization.

1243014552121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23453104810.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 1243014552121 its reverse (1212554103421), we get a palindrome (2455568655542).

The spelling of 1243014552121 in words is "one trillion, two hundred forty-three billion, fourteen million, five hundred fifty-two thousand, one hundred twenty-one".