20012220221 has 32 divisors (see below), whose sum is σ = 23998464000. Its totient is φ = 16327866240.

The previous prime is 20012220169. The next prime is 20012220251. The reversal of 20012220221 is 12202221002.

It is not a de Polignac number, because 20012220221 - 2¹⁸ = 20011958077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012220196 and 20012220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012220251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4302305 + ... + 4306953.

It is an arithmetic number, because the mean of its divisors is an integer number (749952000).

Almost surely, 2^20012220221 is an apocalyptic number.

It is an amenable number.

20012220221 is a deficient number, since it is larger than the sum of its proper divisors (3986243779).

20012220221 is a wasteful number, since it uses less digits than its factorization.

20012220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5009.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20012220221 its reverse (12202221002), we get a palindrome (32214441223).

It can be divided in two parts, 2001 and 2220221, that added together give a palindrome (2222222).

The spelling of 20012220221 in words is "twenty billion, twelve million, two hundred twenty thousand, two hundred twenty-one".