20002021111221 has 4 divisors (see below), whose sum is σ = 26669361481632. Its totient is φ = 13334680740812.

The previous prime is 20002021111217. The next prime is 20002021111249. The reversal of 20002021111221 is 12211112020002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20002021111221 - 2² = 20002021111217 is a prime.

It is a super-2 number, since 2×20002021111221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20002021111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002021111201) 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, 3333670185201 + ... + 3333670185206.

It is an arithmetic number, because the mean of its divisors is an integer number (6667340370408).

Almost surely, 2^{20002021111221} is an apocalyptic number.

It is an amenable number.

20002021111221 is a deficient number, since it is larger than the sum of its proper divisors (6667340370411).

20002021111221 is an equidigital number, since it uses as much as digits as its factorization.

20002021111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6667340370410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20002021111221 its reverse (12211112020002), we get a palindrome (32213133131223).

The spelling of 20002021111221 in words is "twenty trillion, two billion, twenty-one million, one hundred eleven thousand, two hundred twenty-one".