1200220021221 has 32 divisors (see below), whose sum is σ = 1748251045632. Its totient is φ = 728015662080.

The previous prime is 1200220021201. The next prime is 1200220021229. The reversal of 1200220021221 is 1221200220021.

It is not a de Polignac number, because 1200220021221 - 2¹⁸ = 1200219759077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200220021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200220021229) 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 in 31 ways as a sum of consecutive naturals, for example, 45336 + ... + 1549998.

It is an arithmetic number, because the mean of its divisors is an integer number (54632845176).

Almost surely, 2^{1200220021221} is an apocalyptic number.

It is an amenable number.

1200220021221 is a deficient number, since it is larger than the sum of its proper divisors (548031024411).

1200220021221 is a wasteful number, since it uses less digits than its factorization.

1200220021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504973.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1200220021221 its reverse (1221200220021), we get a palindrome (2421420241242).

The spelling of 1200220021221 in words is "one trillion, two hundred billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".