1200100012221 has 32 divisors (see below), whose sum is σ = 1785456908928. Its totient is φ = 710833111040.

The previous prime is 1200100012219. The next prime is 1200100012231. The reversal of 1200100012221 is 1222100010021.

It is a cyclic number.

It is not a de Polignac number, because 1200100012221 - 2¹ = 1200100012219 is a prime.

1200100012221 is a modest number, since divided by 12221 gives 12001 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1200100012197 and 1200100012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200100012231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 885456 + ... + 1784441.

It is an arithmetic number, because the mean of its divisors is an integer number (55795528404).

Almost surely, 2^{1200100012221} is an apocalyptic number.

1200100012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200100012221 is a deficient number, since it is larger than the sum of its proper divisors (585356896707).

1200100012221 is a wasteful number, since it uses less digits than its factorization.

1200100012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2670221.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1200100012221 its reverse (1222100010021), we get a palindrome (2422200022242).

The spelling of 1200100012221 in words is "one trillion, two hundred billion, one hundred million, twelve thousand, two hundred twenty-one".