221212212110203 has 4 divisors (see below), whose sum is σ = 230830134375888. Its totient is φ = 211594289844520.

The previous prime is 221212212110077. The next prime is 221212212110213. The reversal of 221212212110203 is 302011212212122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221212212110203 - 2⁴⁵ = 186027840021371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212212110213) 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, 4808961132808 + ... + 4808961132853.

It is an arithmetic number, because the mean of its divisors is an integer number (57707533593972).

Almost surely, 2^{221212212110203} is an apocalyptic number.

221212212110203 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

221212212110203 is a deficient number, since it is larger than the sum of its proper divisors (9617922265685).

221212212110203 is an equidigital number, since it uses as much as digits as its factorization.

221212212110203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9617922265684.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 221212212110203 its reverse (302011212212122), we get a palindrome (523223424322325).

The spelling of 221212212110203 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred twelve million, one hundred ten thousand, two hundred three".