20021012221 has 8 divisors (see below), whose sum is σ = 22882512384. Its totient is φ = 17159850960.

The previous prime is 20021012189. The next prime is 20021012227. The reversal of 20021012221 is 12221012002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20021012221 - 2⁵ = 20021012189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021012227) 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 7 ways as a sum of consecutive naturals, for example, 57876 + ... + 208306.

It is an arithmetic number, because the mean of its divisors is an integer number (2860314048).

Almost surely, 2^20021012221 is an apocalyptic number.

It is an amenable number.

20021012221 is a deficient number, since it is larger than the sum of its proper divisors (2861500163).

20021012221 is a wasteful number, since it uses less digits than its factorization.

20021012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169451.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20021012221 its reverse (12221012002), we get a palindrome (32242024223).

The spelling of 20021012221 in words is "twenty billion, twenty-one million, twelve thousand, two hundred twenty-one".