20021202111221 has 8 divisors (see below), whose sum is σ = 20448921601920. Its totient is φ = 19593554973408.

The previous prime is 20021202111191. The next prime is 20021202111259. The reversal of 20021202111221 is 12211120212002.

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

It is a cyclic number.

It is not a de Polignac number, because 20021202111221 - 2¹⁴ = 20021202094837 is a prime.

It is a super-2 number, since 2×20021202111221² (a number of 27 digits) contains 22 as substring.

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 20021202111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021202131221) 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 7 ways as a sum of consecutive naturals, for example, 17528696 + ... + 18635921.

It is an arithmetic number, because the mean of its divisors is an integer number (2556115200240).

Almost surely, 2^{20021202111221} is an apocalyptic number.

It is an amenable number.

20021202111221 is a deficient number, since it is larger than the sum of its proper divisors (427719490699).

20021202111221 is a wasteful number, since it uses less digits than its factorization.

20021202111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36176443.

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

Adding to 20021202111221 its reverse (12211120212002), we get a palindrome (32232322323223).

The spelling of 20021202111221 in words is "twenty trillion, twenty-one billion, two hundred two million, one hundred eleven thousand, two hundred twenty-one".