221200121221012 has 12 divisors (see below), whose sum is σ = 387153879206836. Its totient is φ = 110584727161920.

The previous prime is 221200121220943. The next prime is 221200121221033. The reversal of 221200121221012 is 210122121002122.

It can be written as a sum of positive squares in 2 ways, for example, as 210283467331716 + 10916653889296 = 14501154^2 + 3304036^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3833329689 + ... + 3833387392.

Almost surely, 2^{221200121221012} is an apocalyptic number.

It is an amenable number.

221200121221012 is a deficient number, since it is larger than the sum of its proper divisors (165953757985824).

221200121221012 is a wasteful number, since it uses less digits than its factorization.

221200121221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7666724298 (or 7666724296 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221200121221012 its reverse (210122121002122), we get a palindrome (431322242223134).

The spelling of 221200121221012 in words is "two hundred twenty-one trillion, two hundred billion, one hundred twenty-one million, two hundred twenty-one thousand, twelve".