102020210221 has 4 divisors (see below), whose sum is σ = 102023886844. Its totient is φ = 102016533600.

The previous prime is 102020210209. The next prime is 102020210239. The reversal of 102020210221 is 122012020201.

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: 122012020201 = 73 ⋅1671397537.

It can be written as a sum of positive squares in 2 ways, for example, as 13686426121 + 88333784100 = 116989^2 + 297210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102020210221 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 (102020210821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1796370 + ... + 1852291.

It is an arithmetic number, because the mean of its divisors is an integer number (25505971711).

Almost surely, 2^102020210221 is an apocalyptic number.

It is an amenable number.

102020210221 is a deficient number, since it is larger than the sum of its proper divisors (3676623).

102020210221 is an equidigital number, since it uses as much as digits as its factorization.

102020210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3676622.

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

Adding to 102020210221 its reverse (122012020201), we get a palindrome (224032230422).

The spelling of 102020210221 in words is "one hundred two billion, twenty million, two hundred ten thousand, two hundred twenty-one".