20002022121221 has 16 divisors (see below), whose sum is σ = 22890162892800. Its totient is φ = 17121565766448.

The previous prime is 20002022121119. The next prime is 20002022121223. The reversal of 20002022121221 is 12212122020002.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20002022121221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20002022121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002022121223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33612356 + ... + 34202258.

It is an arithmetic number, because the mean of its divisors is an integer number (1430635180800).

Almost surely, 2^{20002022121221} is an apocalyptic number.

It is an amenable number.

20002022121221 is a deficient number, since it is larger than the sum of its proper divisors (2888140771579).

20002022121221 is an equidigital number, since it uses as much as digits as its factorization.

20002022121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596408.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20002022121221 its reverse (12212122020002), we get a palindrome (32214144141223).

The spelling of 20002022121221 in words is "twenty trillion, two billion, twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".