1200100022221 has 2 divisors, whose sum is σ = 1200100022222. Its totient is φ = 1200100022220.

The previous prime is 1200100022213. The next prime is 1200100022263. The reversal of 1200100022221 is 1222200010021.

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., 1190250452196 + 9849570025 = 1090986^2 + 99245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200100022221 - 2³ = 1200100022213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200100022321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600050011110 + 600050011111.

It is an arithmetic number, because the mean of its divisors is an integer number (600050011111).

Almost surely, 2^{1200100022221} is an apocalyptic number.

It is an amenable number.

1200100022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200100022221 is an equidigital number, since it uses as much as digits as its factorization.

1200100022221 is an evil number, because the sum of its binary digits is even.

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

Adding to 1200100022221 its reverse (1222200010021), we get a palindrome (2422300032242).

The spelling of 1200100022221 in words is "one trillion, two hundred billion, one hundred million, twenty-two thousand, two hundred twenty-one".