10101010221 has 6 divisors (see below), whose sum is σ = 14590348110. Its totient is φ = 6734006808.

The previous prime is 10101010201. The next prime is 10101010243. The reversal of 10101010221 is 12201010101.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6302136996 + 3798873225 = 79386^2 + 61635^2 .

It is not a de Polignac number, because 10101010221 - 2⁵ = 10101010189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1122334469 = 10101010221 / (1 + 0 + 1 + 0 + 1 + 0 + 1 + 0 + 2 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10101010201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 561167226 + ... + 561167243.

It is an arithmetic number, because the mean of its divisors is an integer number (2431724685).

Almost surely, 2^10101010221 is an apocalyptic number.

It is an amenable number.

10101010221 is a deficient number, since it is larger than the sum of its proper divisors (4489337889).

10101010221 is a wasteful number, since it uses less digits than its factorization.

10101010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122334475 (or 1122334472 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 10101010221 its reverse (12201010101), we get a palindrome (22302020322).

The spelling of 10101010221 in words is "ten billion, one hundred one million, ten thousand, two hundred twenty-one".