1200120101221 has 4 divisors (see below), whose sum is σ = 1229391323244. Its totient is φ = 1170848879200.

The previous prime is 1200120101183. The next prime is 1200120101317. The reversal of 1200120101221 is 1221010210021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26394876225 + 1173725224996 = 162465^2 + 1083386^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200120101221 - 2⁹ = 1200120100709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200120111221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14635610950 + ... + 14635611031.

It is an arithmetic number, because the mean of its divisors is an integer number (307347830811).

Almost surely, 2^{1200120101221} is an apocalyptic number.

It is an amenable number.

1200120101221 is a deficient number, since it is larger than the sum of its proper divisors (29271222023).

1200120101221 is an equidigital number, since it uses as much as digits as its factorization.

1200120101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29271222022.

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

Adding to 1200120101221 its reverse (1221010210021), we get a palindrome (2421130311242).

The spelling of 1200120101221 in words is "one trillion, two hundred billion, one hundred twenty million, one hundred one thousand, two hundred twenty-one".