220821305028 has 24 divisors (see below), whose sum is σ = 516377185632. Its totient is φ = 73446033984.

The previous prime is 220821305021. The next prime is 220821305083. The reversal of 220821305028 is 820503128022.

It is a self number, because there is not a number n which added to its sum of digits gives 220821305028.

It is not an unprimeable number, because it can be changed into a prime (220821305021) 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, 20127750 + ... + 20138717.

It is an arithmetic number, because the mean of its divisors is an integer number (21515716068).

Almost surely, 2^220821305028 is an apocalyptic number.

It is an amenable number.

220821305028 is an abundant number, since it is smaller than the sum of its proper divisors (295555880604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220821305028 is a wasteful number, since it uses less digits than its factorization.

220821305028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40266931 (or 40266929 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The spelling of 220821305028 in words is "two hundred twenty billion, eight hundred twenty-one million, three hundred five thousand, twenty-eight".