101202221 has 2 divisors, whose sum is σ = 101202222. Its totient is φ = 101202220.

The previous prime is 101202217. The next prime is 101202223. The reversal of 101202221 is 122202101.

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., 75446596 + 25755625 = 8686^2 + 5075^2 .

It is a cyclic number.

It is not a de Polignac number, because 101202221 - 2² = 101202217 is a prime.

It is a Sophie Germain prime.

Together with 101202223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101202223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50601110 + 50601111.

It is an arithmetic number, because the mean of its divisors is an integer number (50601111).

Almost surely, 2^101202221 is an apocalyptic number.

It is an amenable number.

101202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

101202221 is an equidigital number, since it uses as much as digits as its factorization.

101202221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 101202221 is about 10059.9314609991. The cubic root of 101202221 is about 466.0115505497.

Adding to 101202221 its reverse (122202101), we get a palindrome (223404322).

The spelling of 101202221 in words is "one hundred one million, two hundred two thousand, two hundred twenty-one".