1213552413443 has 4 divisors (see below), whose sum is σ = 1213557284088. Its totient is φ = 1213547542800.

The previous prime is 1213552413433. The next prime is 1213552413461. The reversal of 1213552413443 is 3443142553121.

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

It is a cyclic number.

It is not a de Polignac number, because 1213552413443 - 2¹⁶ = 1213552347907 is a prime.

It is a super-2 number, since 2×1213552413443² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213552413397 and 1213552413406.

It is not an unprimeable number, because it can be changed into a prime (1213552413413) 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, 2040221 + ... + 2567022.

It is an arithmetic number, because the mean of its divisors is an integer number (303389321022).

Almost surely, 2^{1213552413443} is an apocalyptic number.

1213552413443 is a deficient number, since it is larger than the sum of its proper divisors (4870645).

1213552413443 is an equidigital number, since it uses as much as digits as its factorization.

1213552413443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4870644.

The product of its digits is 172800, while the sum is 38.

Adding to 1213552413443 its reverse (3443142553121), we get a palindrome (4656694966564).

The spelling of 1213552413443 in words is "one trillion, two hundred thirteen billion, five hundred fifty-two million, four hundred thirteen thousand, four hundred forty-three".