243121220351 has 2 divisors, whose sum is σ = 243121220352. Its totient is φ = 243121220350.

The previous prime is 243121220339. The next prime is 243121220359. The reversal of 243121220351 is 153022121342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121220351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243121220351.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121220359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560610175 + 121560610176.

It is an arithmetic number, because the mean of its divisors is an integer number (121560610176).

Almost surely, 2^243121220351 is an apocalyptic number.

243121220351 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121220351 is an equidigital number, since it uses as much as digits as its factorization.

243121220351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 243121220351 its reverse (153022121342), we get a palindrome (396143341693).

Subtracting from 243121220351 its reverse (153022121342), we obtain a palindrome (90099099009).

The spelling of 243121220351 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twenty thousand, three hundred fifty-one".