1200211022221 has 2 divisors, whose sum is σ = 1200211022222. Its totient is φ = 1200211022220.

The previous prime is 1200211022209. The next prime is 1200211022261. The reversal of 1200211022221 is 1222201120021.

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., 992243100996 + 207967921225 = 996114^2 + 456035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200211022221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200211022195 and 1200211022204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200211022261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600105511110 + 600105511111.

It is an arithmetic number, because the mean of its divisors is an integer number (600105511111).

Almost surely, 2^{1200211022221} is an apocalyptic number.

It is an amenable number.

1200211022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200211022221 is an equidigital number, since it uses as much as digits as its factorization.

1200211022221 is an evil number, because the sum of its binary digits is even.

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

Adding to 1200211022221 its reverse (1222201120021), we get a palindrome (2422412142242).

The spelling of 1200211022221 in words is "one trillion, two hundred billion, two hundred eleven million, twenty-two thousand, two hundred twenty-one".