8210120221 has 4 divisors (see below), whose sum is σ = 8229715200. Its totient is φ = 8190525244.

The previous prime is 8210120179. The next prime is 8210120239. The reversal of 8210120221 is 1220210128.

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.

It is a cyclic number.

It is not a de Polignac number, because 8210120221 - 2²³ = 8201731613 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 (8210120251) 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, 9796861 + ... + 9797698.

It is an arithmetic number, because the mean of its divisors is an integer number (2057428800).

Almost surely, 2^8210120221 is an apocalyptic number.

It is an amenable number.

8210120221 is a deficient number, since it is larger than the sum of its proper divisors (19594979).

8210120221 is a wasteful number, since it uses less digits than its factorization.

8210120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19594978.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 8210120221 is about 90609.7137231986. The cubic root of 8210120221 is about 2017.3589165255.

Adding to 8210120221 its reverse (1220210128), we get a palindrome (9430330349).

The spelling of 8210120221 in words is "eight billion, two hundred ten million, one hundred twenty thousand, two hundred twenty-one".