20002002122221 has 32 divisors (see below), whose sum is σ = 23437990960128. Its totient is φ = 16714848433920.

The previous prime is 20002002122173. The next prime is 20002002122251. The reversal of 20002002122221 is 12222120020002.

It is not a de Polignac number, because 20002002122221 - 2⁹ = 20002002121709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002002122195 and 20002002122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002002122251) 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, 120388476 + ... + 120554506.

It is an arithmetic number, because the mean of its divisors is an integer number (732437217504).

Almost surely, 2^{20002002122221} is an apocalyptic number.

It is an amenable number.

20002002122221 is a deficient number, since it is larger than the sum of its proper divisors (3435988837907).

20002002122221 is a wasteful number, since it uses less digits than its factorization.

20002002122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168141.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20002002122221 its reverse (12222120020002), we get a palindrome (32224122142223).

The spelling of 20002002122221 in words is "twenty trillion, two billion, two million, one hundred twenty-two thousand, two hundred twenty-one".