1200222112021 has 4 divisors (see below), whose sum is σ = 1200281699500. Its totient is φ = 1200162524544.

The previous prime is 1200222111989. The next prime is 1200222112073. The reversal of 1200222112021 is 1202112220021.

It is a happy number.

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 325550124900 + 874671987121 = 570570^2 + 935239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200222112021 - 2⁵ = 1200222111989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200222111986 and 1200222112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200222112081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29763516 + ... + 29803813.

It is an arithmetic number, because the mean of its divisors is an integer number (300070424875).

Almost surely, 2^{1200222112021} is an apocalyptic number.

It is an amenable number.

1200222112021 is a deficient number, since it is larger than the sum of its proper divisors (59587479).

1200222112021 is an equidigital number, since it uses as much as digits as its factorization.

1200222112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59587478.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1200222112021 its reverse (1202112220021), we get a palindrome (2402334332042).

The spelling of 1200222112021 in words is "one trillion, two hundred billion, two hundred twenty-two million, one hundred twelve thousand, twenty-one".