20020102020221 has 4 divisors (see below), whose sum is σ = 21197755080252. Its totient is φ = 18842448960192.

The previous prime is 20020102020091. The next prime is 20020102020227. The reversal of 20020102020221 is 12202020102002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13816943923225 + 6203158096996 = 3717115^2 + 2490614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020102020221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020102020196 and 20020102020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020102020227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588826529990 + ... + 588826530023.

It is an arithmetic number, because the mean of its divisors is an integer number (5299438770063).

Almost surely, 2^{20020102020221} is an apocalyptic number.

It is an amenable number.

20020102020221 is a deficient number, since it is larger than the sum of its proper divisors (1177653060031).

20020102020221 is a wasteful number, since it uses less digits than its factorization.

20020102020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177653060030.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20020102020221 its reverse (12202020102002), we get a palindrome (32222122122223).

The spelling of 20020102020221 in words is "twenty trillion, twenty billion, one hundred two million, twenty thousand, two hundred twenty-one".