243132221251 has 2 divisors, whose sum is σ = 243132221252. Its totient is φ = 243132221250.

The previous prime is 243132221219. The next prime is 243132221261. The reversal of 243132221251 is 152122231342.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243132221251 - 2⁵ = 243132221219 is a prime.

It is a super-2 number, since 2×243132221251² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243132221261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121566110625 + 121566110626.

It is an arithmetic number, because the mean of its divisors is an integer number (121566110626).

Almost surely, 2^243132221251 is an apocalyptic number.

243132221251 is a deficient number, since it is larger than the sum of its proper divisors (1).

243132221251 is an equidigital number, since it uses as much as digits as its factorization.

243132221251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 28.

Adding to 243132221251 its reverse (152122231342), we get a palindrome (395254452593).

The spelling of 243132221251 in words is "two hundred forty-three billion, one hundred thirty-two million, two hundred twenty-one thousand, two hundred fifty-one".