20021110221221 has 8 divisors (see below), whose sum is σ = 20487036386784. Its totient is φ = 19555198553520.

The previous prime is 20021110221191. The next prime is 20021110221251. The reversal of 20021110221221 is 12212201112002.

It is an interprime number because it is at equal distance from previous prime (20021110221191) and next prime (20021110221251).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021110221221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021110221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021110221251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 805166 + ... + 6378911.

It is an arithmetic number, because the mean of its divisors is an integer number (2560879548348).

Almost surely, 2^{20021110221221} is an apocalyptic number.

It is an amenable number.

20021110221221 is a deficient number, since it is larger than the sum of its proper divisors (465926165563).

20021110221221 is an equidigital number, since it uses as much as digits as its factorization.

20021110221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7248931.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20021110221221 its reverse (12212201112002), we get a palindrome (32233311333223).

The spelling of 20021110221221 in words is "twenty trillion, twenty-one billion, one hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".