1200221020021 has 2 divisors, whose sum is σ = 1200221020022. Its totient is φ = 1200221020020.

The previous prime is 1200221020013. The next prime is 1200221020057. The reversal of 1200221020021 is 1200201220021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1181103809796 + 19117210225 = 1086786^2 + 138265^2 .

It is an emirp because it is prime and its reverse (1200201220021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200221020021 - 2³ = 1200221020013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200221019983 and 1200221020010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200221020321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600110510010 + 600110510011.

It is an arithmetic number, because the mean of its divisors is an integer number (600110510011).

Almost surely, 2^{1200221020021} is an apocalyptic number.

It is an amenable number.

1200221020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200221020021 is an equidigital number, since it uses as much as digits as its factorization.

1200221020021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1200221020021 its reverse (1200201220021), we get a palindrome (2400422240042).

The spelling of 1200221020021 in words is "one trillion, two hundred billion, two hundred twenty-one million, twenty thousand, twenty-one".