1001202221 has 2 divisors, whose sum is σ = 1001202222. Its totient is φ = 1001202220.

The previous prime is 1001202197. The next prime is 1001202229. The reversal of 1001202221 is 1222021001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 830246596 + 170955625 = 28814^2 + 13075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001202221 - 2¹⁰ = 1001201197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001202229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500601110 + 500601111.

It is an arithmetic number, because the mean of its divisors is an integer number (500601111).

Almost surely, 2^1001202221 is an apocalyptic number.

It is an amenable number.

1001202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001202221 is an equidigital number, since it uses as much as digits as its factorization.

1001202221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1001202221 is about 31641.7796749804. The cubic root of 1001202221 is about 1000.4005798477.

Adding to 1001202221 its reverse (1222021001), we get a palindrome (2223223222).

The spelling of 1001202221 in words is "one billion, one million, two hundred two thousand, two hundred twenty-one".