243102421 has 2 divisors, whose sum is σ = 243102422. Its totient is φ = 243102420.

The previous prime is 243102413. The next prime is 243102443. The reversal of 243102421 is 124201342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191822500 + 51279921 = 13850^2 + 7161^2 .

It is a cyclic number.

It is not a de Polignac number, because 243102421 - 2³ = 243102413 is a prime.

It is a super-2 number, since 2×243102421² = 118197574192122482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243102451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121551210 + 121551211.

It is an arithmetic number, because the mean of its divisors is an integer number (121551211).

Almost surely, 2^243102421 is an apocalyptic number.

It is an amenable number.

243102421 is a deficient number, since it is larger than the sum of its proper divisors (1).

243102421 is an equidigital number, since it uses as much as digits as its factorization.

243102421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 243102421 is about 15591.7420771381. The cubic root of 243102421 is about 624.1128071380.

Adding to 243102421 its reverse (124201342), we get a palindrome (367303763).

The spelling of 243102421 in words is "two hundred forty-three million, one hundred two thousand, four hundred twenty-one".