8124112221 has 4 divisors (see below), whose sum is σ = 10832149632. Its totient is φ = 5416074812.

The previous prime is 8124112189. The next prime is 8124112253. The reversal of 8124112221 is 1222114218.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (8124112189) and next prime (8124112253).

It is a cyclic number.

It is not a de Polignac number, because 8124112221 - 2⁵ = 8124112189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8124112191 and 8124112200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8124119221) 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, 1354018701 + ... + 1354018706.

It is an arithmetic number, because the mean of its divisors is an integer number (2708037408).

Almost surely, 2^8124112221 is an apocalyptic number.

It is an amenable number.

8124112221 is a deficient number, since it is larger than the sum of its proper divisors (2708037411).

8124112221 is a wasteful number, since it uses less digits than its factorization.

8124112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708037410.

The product of its digits is 512, while the sum is 24.

The square root of 8124112221 is about 90133.8572402180. The cubic root of 8124112221 is about 2010.2896557887.

Adding to 8124112221 its reverse (1222114218), we get a palindrome (9346226439).

The spelling of 8124112221 in words is "eight billion, one hundred twenty-four million, one hundred twelve thousand, two hundred twenty-one".