210020111221 has 4 divisors (see below), whose sum is σ = 210044790252. Its totient is φ = 209995432192.

The previous prime is 210020111183. The next prime is 210020111233. The reversal of 210020111221 is 122111020012.

210020111221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 200716544196 + 9303567025 = 448014^2 + 96455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210020111221 is a prime.

It is a super-2 number, since 2×210020111221² (a number of 23 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 (210020711221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12326746 + ... + 12343771.

It is an arithmetic number, because the mean of its divisors is an integer number (52511197563).

Almost surely, 2^210020111221 is an apocalyptic number.

It is an amenable number.

210020111221 is a deficient number, since it is larger than the sum of its proper divisors (24679031).

210020111221 is an equidigital number, since it uses as much as digits as its factorization.

210020111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24679030.

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

Adding to 210020111221 its reverse (122111020012), we get a palindrome (332131131233).

The spelling of 210020111221 in words is "two hundred ten billion, twenty million, one hundred eleven thousand, two hundred twenty-one".