1213420553205 has 64 divisors (see below), whose sum is σ = 2227466618880. Its totient is φ = 552547858176.

The previous prime is 1213420553197. The next prime is 1213420553243. The reversal of 1213420553205 is 5023550243121.

It is not a de Polignac number, because 1213420553205 - 2³ = 1213420553197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 110920626 + ... + 110931564.

It is an arithmetic number, because the mean of its divisors is an integer number (34804165920).

Almost surely, 2^{1213420553205} is an apocalyptic number.

1213420553205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213420553205 is a deficient number, since it is larger than the sum of its proper divisors (1014046065675).

1213420553205 is a wasteful number, since it uses less digits than its factorization.

1213420553205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14970.

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 1213420553205 its reverse (5023550243121), we get a palindrome (6236970796326).

The spelling of 1213420553205 in words is "one trillion, two hundred thirteen billion, four hundred twenty million, five hundred fifty-three thousand, two hundred five".