221212321121243 has 4 divisors (see below), whose sum is σ = 221228262067680. Its totient is φ = 221196380174808.

The previous prime is 221212321121191. The next prime is 221212321121261. The reversal of 221212321121243 is 342121123212122.

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 221212321121243 - 2¹² = 221212321117147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212321151243) 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, 7970452403 + ... + 7970480156.

It is an arithmetic number, because the mean of its divisors is an integer number (55307065516920).

Almost surely, 2^{221212321121243} is an apocalyptic number.

221212321121243 is a deficient number, since it is larger than the sum of its proper divisors (15940946437).

221212321121243 is a wasteful number, since it uses less digits than its factorization.

221212321121243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15940946436.

The product of its digits is 4608, while the sum is 29.

Adding to 221212321121243 its reverse (342121123212122), we get a palindrome (563333444333365).

The spelling of 221212321121243 in words is "two hundred twenty-one trillion, two hundred twelve billion, three hundred twenty-one million, one hundred twenty-one thousand, two hundred forty-three".