243031302421 has 2 divisors, whose sum is σ = 243031302422. Its totient is φ = 243031302420.

The previous prime is 243031302391. The next prime is 243031302467. The reversal of 243031302421 is 124203130342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223124914321 + 19906388100 = 472361^2 + 141090^2 .

It is a cyclic number.

It is not a de Polignac number, because 243031302421 - 2¹¹ = 243031300373 is a prime.

It is a super-2 number, since 2×243031302421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243031102421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121515651210 + 121515651211.

It is an arithmetic number, because the mean of its divisors is an integer number (121515651211).

Almost surely, 2^243031302421 is an apocalyptic number.

It is an amenable number.

243031302421 is a deficient number, since it is larger than the sum of its proper divisors (1).

243031302421 is an equidigital number, since it uses as much as digits as its factorization.

243031302421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 243031302421 its reverse (124203130342), we get a palindrome (367234432763).

The spelling of 243031302421 in words is "two hundred forty-three billion, thirty-one million, three hundred two thousand, four hundred twenty-one".