221212323403 has 4 divisors (see below), whose sum is σ = 221213418048. Its totient is φ = 221211228760.

The previous prime is 221212323401. The next prime is 221212323433. The reversal of 221212323403 is 304323212122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 221212323403 - 2¹ = 221212323401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212323401) 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, 146203 + ... + 681028.

It is an arithmetic number, because the mean of its divisors is an integer number (55303354512).

Almost surely, 2^221212323403 is an apocalyptic number.

221212323403 is a deficient number, since it is larger than the sum of its proper divisors (1094645).

221212323403 is an equidigital number, since it uses as much as digits as its factorization.

221212323403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094644.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 221212323403 its reverse (304323212122), we get a palindrome (525535535525).

The spelling of 221212323403 in words is "two hundred twenty-one billion, two hundred twelve million, three hundred twenty-three thousand, four hundred three".