1200000221205 has 32 divisors (see below), whose sum is σ = 1982544273408. Its totient is φ = 619164820800.

The previous prime is 1200000221191. The next prime is 1200000221213. The reversal of 1200000221205 is 5021220000021.

It is not a de Polignac number, because 1200000221205 - 2⁹ = 1200000220693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 31 ways as a sum of consecutive naturals, for example, 1126542 + ... + 1915488.

It is an arithmetic number, because the mean of its divisors is an integer number (61954508544).

Almost surely, 2^{1200000221205} is an apocalyptic number.

1200000221205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1200000221205 is a deficient number, since it is larger than the sum of its proper divisors (782544052203).

1200000221205 is a wasteful number, since it uses less digits than its factorization.

1200000221205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792257.

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 1200000221205 its reverse (5021220000021), we get a palindrome (6221220221226).

The spelling of 1200000221205 in words is "one trillion, two hundred billion, two hundred twenty-one thousand, two hundred five".