1200120111221 has 2 divisors, whose sum is σ = 1200120111222. Its totient is φ = 1200120111220.

The previous prime is 1200120111209. The next prime is 1200120111283. The reversal of 1200120111221 is 1221110210021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 710246103121 + 489874008100 = 842761^2 + 699910^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200120111221 - 2¹⁰ = 1200120110197 is a prime.

It is a super-2 number, since 2×1200120111221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1200120111196 and 1200120111205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200120011221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600060055610 + 600060055611.

It is an arithmetic number, because the mean of its divisors is an integer number (600060055611).

Almost surely, 2^{1200120111221} is an apocalyptic number.

It is an amenable number.

1200120111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200120111221 is an equidigital number, since it uses as much as digits as its factorization.

1200120111221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1200120111221 its reverse (1221110210021), we get a palindrome (2421230321242).

The spelling of 1200120111221 in words is "one trillion, two hundred billion, one hundred twenty million, one hundred eleven thousand, two hundred twenty-one".