1200111101221 has 8 divisors (see below), whose sum is σ = 1208642738904. Its totient is φ = 1191590699520.

The previous prime is 1200111101177. The next prime is 1200111101243. The reversal of 1200111101221 is 1221011110021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20962696225 + 1179148404996 = 144785^2 + 1085886^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1200111101221 - 2³¹ = 1197963617573 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 (1200111101821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2594560 + ... + 3021913.

It is an arithmetic number, because the mean of its divisors is an integer number (151080342363).

Almost surely, 2^{1200111101221} is an apocalyptic number.

It is an amenable number.

1200111101221 is a deficient number, since it is larger than the sum of its proper divisors (8531637683).

1200111101221 is a wasteful number, since it uses less digits than its factorization.

1200111101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5617991.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1200111101221 its reverse (1221011110021), we get a palindrome (2421122211242).

The spelling of 1200111101221 in words is "one trillion, two hundred billion, one hundred eleven million, one hundred one thousand, two hundred twenty-one".