1200223111921 has 2 divisors, whose sum is σ = 1200223111922. Its totient is φ = 1200223111920.

The previous prime is 1200223111861. The next prime is 1200223111939. The reversal of 1200223111921 is 1291113220021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 889416861921 + 310806250000 = 943089^2 + 557500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200223111921 - 2⁷ = 1200223111793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200223111991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600111555960 + 600111555961.

It is an arithmetic number, because the mean of its divisors is an integer number (600111555961).

Almost surely, 2^{1200223111921} is an apocalyptic number.

It is an amenable number.

1200223111921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200223111921 is an equidigital number, since it uses as much as digits as its factorization.

1200223111921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

Adding to 1200223111921 its reverse (1291113220021), we get a palindrome (2491336331942).

The spelling of 1200223111921 in words is "one trillion, two hundred billion, two hundred twenty-three million, one hundred eleven thousand, nine hundred twenty-one".