20000020221 has 12 divisors (see below), whose sum is σ = 28891935072. Its totient is φ = 13331954376.

The previous prime is 20000020189. The next prime is 20000020237. The reversal of 20000020221 is 12202000002.

It is not a de Polignac number, because 20000020221 - 2⁵ = 20000020189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000020291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20971 + ... + 201096.

It is an arithmetic number, because the mean of its divisors is an integer number (2407661256).

Almost surely, 2^20000020221 is an apocalyptic number.

It is an amenable number.

20000020221 is a deficient number, since it is larger than the sum of its proper divisors (8891914851).

20000020221 is a wasteful number, since it uses less digits than its factorization.

20000020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232080 (or 232077 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 20000020221 its reverse (12202000002), we get a palindrome (32202020223).

The spelling of 20000020221 in words is "twenty billion, twenty thousand, two hundred twenty-one".