101226221 has 4 divisors (see below), whose sum is σ = 101871132. Its totient is φ = 100581312.

The previous prime is 101226217. The next prime is 101226233. The reversal of 101226221 is 122622101.

101226221 = 404² + 405² + ... + 717².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122622101 = 7 ⋅17517443.

It can be written as a sum of positive squares in 2 ways, for example, as 29214025 + 72012196 = 5405^2 + 8486^2 .

It is a cyclic number.

It is not a de Polignac number, because 101226221 - 2² = 101226217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 101226221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101226271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322220 + ... + 322533.

It is an arithmetic number, because the mean of its divisors is an integer number (25467783).

Almost surely, 2^101226221 is an apocalyptic number.

It is an amenable number.

101226221 is a deficient number, since it is larger than the sum of its proper divisors (644911).

101226221 is an equidigital number, since it uses as much as digits as its factorization.

101226221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644910.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 101226221 is about 10061.1242413559. The cubic root of 101226221 is about 466.0483856873.

Adding to 101226221 its reverse (122622101), we get a palindrome (223848322).

The spelling of 101226221 in words is "one hundred one million, two hundred twenty-six thousand, two hundred twenty-one".