1200120021106 has 4 divisors (see below), whose sum is σ = 1800180031662. Its totient is φ = 600060010552.

The previous prime is 1200120021049. The next prime is 1200120021109. The reversal of 1200120021106 is 6011200210021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1006893840481 + 193226180625 = 1003441^2 + 439575^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1200120021106.

It is not an unprimeable number, because it can be changed into a prime (1200120021109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 300030005275 + ... + 300030005278.

Almost surely, 2^{1200120021106} is an apocalyptic number.

1200120021106 is a deficient number, since it is larger than the sum of its proper divisors (600060010556).

1200120021106 is an equidigital number, since it uses as much as digits as its factorization.

1200120021106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600060010555.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1200120021106 its reverse (6011200210021), we get a palindrome (7211320231127).

The spelling of 1200120021106 in words is "one trillion, two hundred billion, one hundred twenty million, twenty-one thousand, one hundred six".