221212340103 has 4 divisors (see below), whose sum is σ = 294949786808. Its totient is φ = 147474893400.

The previous prime is 221212340093. The next prime is 221212340143. The reversal of 221212340103 is 301043212122.

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

It is not a de Polignac number, because 221212340103 - 2²⁰ = 221211291527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221212340103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212340143) 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, 36868723348 + ... + 36868723353.

It is an arithmetic number, because the mean of its divisors is an integer number (73737446702).

Almost surely, 2^221212340103 is an apocalyptic number.

221212340103 is a deficient number, since it is larger than the sum of its proper divisors (73737446705).

221212340103 is an equidigital number, since it uses as much as digits as its factorization.

221212340103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73737446704.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 221212340103 its reverse (301043212122), we get a palindrome (522255552225).

The spelling of 221212340103 in words is "two hundred twenty-one billion, two hundred twelve million, three hundred forty thousand, one hundred three".