8251022221 has 8 divisors (see below), whose sum is σ = 8891459640. Its totient is φ = 7611405312.

The previous prime is 8251022183. The next prime is 8251022243. The reversal of 8251022221 is 1222201528.

It can be written as a sum of positive squares in 4 ways, for example, as 722856996 + 7528165225 = 26886^2 + 86765^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8251022221 - 2²⁵ = 8217467789 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 (8251020221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184156 + ... + 224533.

It is an arithmetic number, because the mean of its divisors is an integer number (1111432455).

Almost surely, 2^8251022221 is an apocalyptic number.

It is an amenable number.

8251022221 is a deficient number, since it is larger than the sum of its proper divisors (640437419).

8251022221 is a wasteful number, since it uses less digits than its factorization.

8251022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410255.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 8251022221 is about 90835.1375900318. The cubic root of 8251022221 is about 2020.7034622264.

Adding to 8251022221 its reverse (1222201528), we get a palindrome (9473223749).

The spelling of 8251022221 in words is "eight billion, two hundred fifty-one million, twenty-two thousand, two hundred twenty-one".