8888888821 has 16 divisors (see below), whose sum is σ = 9846779904. Its totient is φ = 7981245184.

The previous prime is 8888888809. The next prime is 8888888837. The reversal of 8888888821 is 1288888888.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8888888821 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8888888891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120075 + ... + 179431.

It is an arithmetic number, because the mean of its divisors is an integer number (615423744).

Almost surely, 2^8888888821 is an apocalyptic number.

It is an amenable number.

8888888821 is a deficient number, since it is larger than the sum of its proper divisors (957891083).

8888888821 is a wasteful number, since it uses less digits than its factorization.

8888888821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59780.

The product of its digits is 33554432, while the sum is 67.

The square root of 8888888821 is about 94280.9037981711. The cubic root of 8888888821 is about 2071.4883320289.

Adding to 8888888821 its sum of digits (67), we get a palindrome (8888888888).

The spelling of 8888888821 in words is "eight billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred twenty-one".