221212261243 has 8 divisors (see below), whose sum is σ = 222547250016. Its totient is φ = 219877920000.

The previous prime is 221212261241. The next prime is 221212261321. The reversal of 221212261243 is 342162212122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221212261243 - 2¹ = 221212261241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212261241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 532378 + ... + 851968.

It is an arithmetic number, because the mean of its divisors is an integer number (27818406252).

Almost surely, 2^221212261243 is an apocalyptic number.

221212261243 is a deficient number, since it is larger than the sum of its proper divisors (1334988773).

221212261243 is a wasteful number, since it uses less digits than its factorization.

221212261243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323765.

The product of its digits is 4608, while the sum is 28.

Adding to 221212261243 its reverse (342162212122), we get a palindrome (563374473365).

The spelling of 221212261243 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred sixty-one thousand, two hundred forty-three".