101010221 has 4 divisors (see below), whose sum is σ = 108780252. Its totient is φ = 93240192.

The previous prime is 101010199. The next prime is 101010223. The reversal of 101010221 is 122010101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57304900 + 43705321 = 7570^2 + 6611^2 .

It is a cyclic number.

It is not a de Polignac number, because 101010221 - 2⁶ = 101010157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101010199 and 101010208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101010223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3884996 + ... + 3885021.

It is an arithmetic number, because the mean of its divisors is an integer number (27195063).

Almost surely, 2^101010221 is an apocalyptic number.

It is an amenable number.

101010221 is a deficient number, since it is larger than the sum of its proper divisors (7770031).

101010221 is an equidigital number, since it uses as much as digits as its factorization.

101010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7770030.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 101010221 is about 10050.3841220125. The cubic root of 101010221 is about 465.7166595885.

Adding to 101010221 its reverse (122010101), we get a palindrome (223020322).

The spelling of 101010221 in words is "one hundred one million, ten thousand, two hundred twenty-one".