1200010121221 has 6 divisors (see below), whose sum is σ = 1213644886322. Its totient is φ = 1186526853600.

The previous prime is 1200010121183. The next prime is 1200010121239. The reversal of 1200010121221 is 1221210100021.

It can be written as a sum of positive squares in 3 ways, for example, as 40326664225 + 1159683456996 = 200815^2 + 1076886^2 .

It is not a de Polignac number, because 1200010121221 - 2⁹ = 1200010120709 is a prime.

It is a super-2 number, since 2×1200010121221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200010121291) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 75740730 + ... + 75756571.

Almost surely, 2^{1200010121221} is an apocalyptic number.

It is an amenable number.

1200010121221 is a deficient number, since it is larger than the sum of its proper divisors (13634765101).

1200010121221 is an frugal number, since it uses more digits than its factorization.

1200010121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151497479 (or 151497390 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1200010121221 its reverse (1221210100021), we get a palindrome (2421220221242).

It can be divided in two parts, 1200010 and 121221, that added together give a palindrome (1321231).

The spelling of 1200010121221 in words is "one trillion, two hundred billion, ten million, one hundred twenty-one thousand, two hundred twenty-one".