210000111221 has 4 divisors (see below), whose sum is σ = 213559435200. Its totient is φ = 206440787244.

The previous prime is 210000111173. The next prime is 210000111287. The reversal of 210000111221 is 122111000012.

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 210000111221 - 2⁶ = 210000111157 is a prime.

It is a super-2 number, since 2×210000111221² (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 (210000111821) 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, 1779661901 + ... + 1779662018.

It is an arithmetic number, because the mean of its divisors is an integer number (53389858800).

Almost surely, 2^210000111221 is an apocalyptic number.

It is an amenable number.

210000111221 is a deficient number, since it is larger than the sum of its proper divisors (3559323979).

210000111221 is an equidigital number, since it uses as much as digits as its factorization.

210000111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3559323978.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 210000111221 its reverse (122111000012), we get a palindrome (332111111233).

The spelling of 210000111221 in words is "two hundred ten billion, one hundred eleven thousand, two hundred twenty-one".