221212310323 has 4 divisors (see below), whose sum is σ = 226607732568. Its totient is φ = 215816888080.

The previous prime is 221212310311. The next prime is 221212310327. The reversal of 221212310323 is 323013212122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 323013212122 = 2 ⋅161506606061.

It is a cyclic number.

It is not a de Polignac number, because 221212310323 - 2⁹ = 221212309811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221212310294 and 221212310303.

It is not an unprimeable number, because it can be changed into a prime (221212310327) 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, 2697711061 + ... + 2697711142.

It is an arithmetic number, because the mean of its divisors is an integer number (56651933142).

Almost surely, 2^221212310323 is an apocalyptic number.

221212310323 is a deficient number, since it is larger than the sum of its proper divisors (5395422245).

221212310323 is an equidigital number, since it uses as much as digits as its factorization.

221212310323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5395422244.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 221212310323 its reverse (323013212122), we get a palindrome (544225522445).

The spelling of 221212310323 in words is "two hundred twenty-one billion, two hundred twelve million, three hundred ten thousand, three hundred twenty-three".