20021001112221 has 16 divisors (see below), whose sum is σ = 27855799050240. Its totient is φ = 12766789172720.

The previous prime is 20021001112181. The next prime is 20021001112237. The reversal of 20021001112221 is 12221110012002.

It is a cyclic number.

It is not a de Polignac number, because 20021001112221 - 2⁶ = 20021001112157 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021001112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021001112261) 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 15 ways as a sum of consecutive naturals, for example, 1401256 + ... + 6481166.

It is an arithmetic number, because the mean of its divisors is an integer number (1740987440640).

Almost surely, 2^{20021001112221} is an apocalyptic number.

It is an amenable number.

20021001112221 is a deficient number, since it is larger than the sum of its proper divisors (7834797938019).

20021001112221 is a wasteful number, since it uses less digits than its factorization.

20021001112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5137056.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20021001112221 its reverse (12221110012002), we get a palindrome (32242111124223).

The spelling of 20021001112221 in words is "twenty trillion, twenty-one billion, one million, one hundred twelve thousand, two hundred twenty-one".