20002220212221 has 32 divisors (see below), whose sum is σ = 31914346705920. Its totient is φ = 12308297740992.

The previous prime is 20002220212193. The next prime is 20002220212223. The reversal of 20002220212221 is 12221202220002.

20002220212221 is a `hidden beast` number, since 200 + 0 + 2 + 220 + 21 + 2 + 221 = 666.

It is not a de Polignac number, because 20002220212221 - 2²¹ = 20002218115069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20002220212194 and 20002220212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002220212223) 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, 3951700 + ... + 7457906.

It is an arithmetic number, because the mean of its divisors is an integer number (997323334560).

Almost surely, 2^{20002220212221} is an apocalyptic number.

It is an amenable number.

20002220212221 is a deficient number, since it is larger than the sum of its proper divisors (11912126493699).

20002220212221 is a wasteful number, since it uses less digits than its factorization.

20002220212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3522482 (or 3522476 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 20002220212221 its reverse (12221202220002), we get a palindrome (32223422432223).

The spelling of 20002220212221 in words is "twenty trillion, two billion, two hundred twenty million, two hundred twelve thousand, two hundred twenty-one".