2220388821 has 32 divisors (see below), whose sum is σ = 3801657600. Its totient is φ = 1254528000.

The previous prime is 2220388817. The next prime is 2220388829. The reversal of 2220388821 is 1288830222.

It is not a de Polignac number, because 2220388821 - 2² = 2220388817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220388829) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49180 + ... + 82821.

It is an arithmetic number, because the mean of its divisors is an integer number (118801800).

Almost surely, 2^2220388821 is an apocalyptic number.

2220388821 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2220388821 is a deficient number, since it is larger than the sum of its proper divisors (1581268779).

2220388821 is a wasteful number, since it uses less digits than its factorization.

2220388821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132106 (or 132100 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 2220388821 is about 47121.0019099764. The cubic root of 2220388821 is about 1304.5969054939.

The spelling of 2220388821 in words is "two billion, two hundred twenty million, three hundred eighty-eight thousand, eight hundred twenty-one".