1200100100221 has 16 divisors (see below), whose sum is σ = 1381471562880. Its totient is φ = 1031839832320.

The previous prime is 1200100100189. The next prime is 1200100100293. The reversal of 1200100100221 is 1220010010021.

It is not a de Polignac number, because 1200100100221 - 2⁵ = 1200100100189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200100100198 and 1200100100207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200100100821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26626240 + ... + 26671273.

It is an arithmetic number, because the mean of its divisors is an integer number (86341972680).

Almost surely, 2^{1200100100221} is an apocalyptic number.

1200100100221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200100100221 is a deficient number, since it is larger than the sum of its proper divisors (181371462659).

1200100100221 is a wasteful number, since it uses less digits than its factorization.

1200100100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53297636.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1200100100221 its reverse (1220010010021), we get a palindrome (2420110110242).

The spelling of 1200100100221 in words is "one trillion, two hundred billion, one hundred million, one hundred thousand, two hundred twenty-one".