102221221 has 4 divisors (see below), whose sum is σ = 108234252. Its totient is φ = 96208192.

The previous prime is 102221213. The next prime is 102221237. The reversal of 102221221 is 122122201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122122201 = 71 ⋅1720031.

It can be written as a sum of positive squares in 2 ways, for example, as 90041121 + 12180100 = 9489^2 + 3490^2 .

It is a cyclic number.

It is not a de Polignac number, because 102221221 - 2³ = 102221213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102221321) 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, 3006490 + ... + 3006523.

It is an arithmetic number, because the mean of its divisors is an integer number (27058563).

Almost surely, 2^102221221 is an apocalyptic number.

It is an amenable number.

102221221 is a deficient number, since it is larger than the sum of its proper divisors (6013031).

102221221 is an equidigital number, since it uses as much as digits as its factorization.

102221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6013030.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 102221221 is about 10110.4510779688. The cubic root of 102221221 is about 467.5704123404.

Adding to 102221221 its reverse (122122201), we get a palindrome (224343422).

The spelling of 102221221 in words is "one hundred two million, two hundred twenty-one thousand, two hundred twenty-one".