102001002221 has 4 divisors (see below), whose sum is σ = 102014557500. Its totient is φ = 101987446944.

The previous prime is 102001002217. The next prime is 102001002223. The reversal of 102001002221 is 122200100201.

It is a happy number.

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 23528185321 + 78472816900 = 153389^2 + 280130^2 .

It is a cyclic number.

It is not a de Polignac number, because 102001002221 - 2² = 102001002217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102001002223) 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, 6766346 + ... + 6781403.

It is an arithmetic number, because the mean of its divisors is an integer number (25503639375).

Almost surely, 2^102001002221 is an apocalyptic number.

It is an amenable number.

102001002221 is a deficient number, since it is larger than the sum of its proper divisors (13555279).

102001002221 is an equidigital number, since it uses as much as digits as its factorization.

102001002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13555278.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 102001002221 its reverse (122200100201), we get a palindrome (224201102422).

The spelling of 102001002221 in words is "one hundred two billion, one million, two thousand, two hundred twenty-one".