1213443255533 has 8 divisors (see below), whose sum is σ = 1219435388640. Its totient is φ = 1207453398480.

The previous prime is 1213443255517. The next prime is 1213443255539. The reversal of 1213443255533 is 3355523443121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213443255533 - 2⁴ = 1213443255517 is a prime.

It is a super-2 number, since 2×1213443255533² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213443255539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504878 + ... + 1637616.

It is an arithmetic number, because the mean of its divisors is an integer number (152429423580).

Almost surely, 2^{1213443255533} is an apocalyptic number.

It is an amenable number.

1213443255533 is a deficient number, since it is larger than the sum of its proper divisors (5992133107).

1213443255533 is a wasteful number, since it uses less digits than its factorization.

1213443255533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138027.

The product of its digits is 648000, while the sum is 41.

Adding to 1213443255533 its reverse (3355523443121), we get a palindrome (4568966698654).

The spelling of 1213443255533 in words is "one trillion, two hundred thirteen billion, four hundred forty-three million, two hundred fifty-five thousand, five hundred thirty-three".