1200000100221 has 18 divisors (see below), whose sum is σ = 1876923236058. Its totient is φ = 738461599200.

The previous prime is 1200000100157. The next prime is 1200000100237. The reversal of 1200000100221 is 1220010000021.

It can be written as a sum of positive squares in 3 ways, for example, as 47084660100 + 1152915440121 = 216990^2 + 1073739^2 .

It is not a de Polignac number, because 1200000100221 - 2⁶ = 1200000100157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200000100241) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 394475830 + ... + 394478871.

Almost surely, 2^{1200000100221} is an apocalyptic number.

It is an amenable number.

1200000100221 is a deficient number, since it is larger than the sum of its proper divisors (676923135837).

1200000100221 is a wasteful number, since it uses less digits than its factorization.

1200000100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788954733 (or 788954717 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1200000100221 its reverse (1220010000021), we get a palindrome (2420010100242).

The spelling of 1200000100221 in words is "one trillion, two hundred billion, one hundred thousand, two hundred twenty-one".