1200221012121 has 32 divisors (see below), whose sum is σ = 1678398105600. Its totient is φ = 762123257280.

The previous prime is 1200221012063. The next prime is 1200221012149. The reversal of 1200221012121 is 1212101220021.

It is not a de Polignac number, because 1200221012121 - 2²³ = 1200212623513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200221012121.

It is not an unprimeable number, because it can be changed into a prime (1200221012161) 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, 1181806 + ... + 1948616.

It is an arithmetic number, because the mean of its divisors is an integer number (52449940800).

Almost surely, 2^{1200221012121} is an apocalyptic number.

It is an amenable number.

1200221012121 is a deficient number, since it is larger than the sum of its proper divisors (478177093479).

1200221012121 is a wasteful number, since it uses less digits than its factorization.

1200221012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767149.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1200221012121 its reverse (1212101220021), we get a palindrome (2412322232142).

The spelling of 1200221012121 in words is "one trillion, two hundred billion, two hundred twenty-one million, twelve thousand, one hundred twenty-one".