221212212210203 has 4 divisors (see below), whose sum is σ = 221227200517680. Its totient is φ = 221197223902728.

The previous prime is 221212212210193. The next prime is 221212212210221. The reversal of 221212212210203 is 302012212212122.

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 221212212210203 - 2¹⁰ = 221212212209179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212212260203) 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, 7494131600 + ... + 7494161117.

It is an arithmetic number, because the mean of its divisors is an integer number (55306800129420).

Almost surely, 2^{221212212210203} is an apocalyptic number.

221212212210203 is a deficient number, since it is larger than the sum of its proper divisors (14988307477).

221212212210203 is a wasteful number, since it uses less digits than its factorization.

221212212210203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14988307476.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 221212212210203 its reverse (302012212212122), we get a palindrome (523224424422325).

The spelling of 221212212210203 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred twelve million, two hundred ten thousand, two hundred three".