20002002121221 has 16 divisors (see below), whose sum is σ = 26779447506240. Its totient is φ = 13279653034880.

The previous prime is 20002002121217. The next prime is 20002002121223. The reversal of 20002002121221 is 12212120020002.

It is a cyclic number.

It is not a de Polignac number, because 20002002121221 - 2² = 20002002121217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20002002121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002002121223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3107055 + ... + 7046828.

It is an arithmetic number, because the mean of its divisors is an integer number (1673715469140).

Almost surely, 2^{20002002121221} is an apocalyptic number.

It is an amenable number.

20002002121221 is a deficient number, since it is larger than the sum of its proper divisors (6777445385019).

20002002121221 is a wasteful number, since it uses less digits than its factorization.

20002002121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10156596.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20002002121221 its reverse (12212120020002), we get a palindrome (32214122141223).

The spelling of 20002002121221 in words is "twenty trillion, two billion, two million, one hundred twenty-one thousand, two hundred twenty-one".