1200504121155 has 12 divisors (see below), whose sum is σ = 2080873810080. Its totient is φ = 640268864592.

The previous prime is 1200504121133. The next prime is 1200504121213. The reversal of 1200504121155 is 5511214050021.

It is a happy number.

1200504121155 is a `hidden beast` number, since 1 + 2 + 0 + 0 + 504 + 1 + 2 + 1 + 155 = 666.

It is not a de Polignac number, because 1200504121155 - 2⁵ = 1200504121123 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13338934635 + ... + 13338934724.

It is an arithmetic number, because the mean of its divisors is an integer number (173406150840).

Almost surely, 2^{1200504121155} is an apocalyptic number.

1200504121155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1200504121155 is a deficient number, since it is larger than the sum of its proper divisors (880369688925).

1200504121155 is a wasteful number, since it uses less digits than its factorization.

1200504121155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26677869370 (or 26677869367 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 1200504121155 its reverse (5511214050021), we get a palindrome (6711718171176).

The spelling of 1200504121155 in words is "one trillion, two hundred billion, five hundred four million, one hundred twenty-one thousand, one hundred fifty-five".