243120222251 has 4 divisors (see below), whose sum is σ = 248774180952. Its totient is φ = 237466263552.

The previous prime is 243120222227. The next prime is 243120222277. The reversal of 243120222251 is 152222021342.

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 243120222251 - 2⁶ = 243120222187 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 243120222251.

It is not an unprimeable number, because it can be changed into a prime (243120222551) 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, 2826979286 + ... + 2826979371.

It is an arithmetic number, because the mean of its divisors is an integer number (62193545238).

Almost surely, 2^243120222251 is an apocalyptic number.

243120222251 is a deficient number, since it is larger than the sum of its proper divisors (5653958701).

243120222251 is an equidigital number, since it uses as much as digits as its factorization.

243120222251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5653958700.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 243120222251 its reverse (152222021342), we get a palindrome (395342243593).

The spelling of 243120222251 in words is "two hundred forty-three billion, one hundred twenty million, two hundred twenty-two thousand, two hundred fifty-one".