20000210111221 has 4 divisors (see below), whose sum is σ = 20004890716972. Its totient is φ = 19995529505472.

The previous prime is 20000210111213. The next prime is 20000210111239. The reversal of 20000210111221 is 12211101200002.

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 9543465562500 + 10456744548721 = 3089250^2 + 3233689^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000210111221 - 2³ = 20000210111213 is a prime.

It is a super-2 number, since 2×20000210111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000210111521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2340296466 + ... + 2340305011.

It is an arithmetic number, because the mean of its divisors is an integer number (5001222679243).

Almost surely, 2^{20000210111221} is an apocalyptic number.

It is an amenable number.

20000210111221 is a deficient number, since it is larger than the sum of its proper divisors (4680605751).

20000210111221 is an equidigital number, since it uses as much as digits as its factorization.

20000210111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4680605750.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20000210111221 its reverse (12211101200002), we get a palindrome (32211311311223).

The spelling of 20000210111221 in words is "twenty trillion, two hundred ten million, one hundred eleven thousand, two hundred twenty-one".