102002221 has 4 divisors (see below), whose sum is σ = 103438944. Its totient is φ = 100565500.

The previous prime is 102002191. The next prime is 102002249. The reversal of 102002221 is 122200201.

102002221 = T₄₆₈ + T₄₆₉ + ... + T₈₉₃.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122200201 = 2971 ⋅41131.

It is a cyclic number.

It is not a de Polignac number, because 102002221 - 2⁵ = 102002189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102002198 and 102002207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102002281) 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, 718255 + ... + 718396.

It is an arithmetic number, because the mean of its divisors is an integer number (25859736).

Almost surely, 2^102002221 is an apocalyptic number.

It is an amenable number.

102002221 is a deficient number, since it is larger than the sum of its proper divisors (1436723).

102002221 is an equidigital number, since it uses as much as digits as its factorization.

102002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436722.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 102002221 is about 10099.6148936482. The cubic root of 102002221 is about 467.2362640665.

Adding to 102002221 its reverse (122200201), we get a palindrome (224202422).

It can be divided in two parts, 10200 and 2221, that added together give a palindrome (12421).

The spelling of 102002221 in words is "one hundred two million, two thousand, two hundred twenty-one".