243102022421 has 2 divisors, whose sum is σ = 243102022422. Its totient is φ = 243102022420.

The previous prime is 243102022409. The next prime is 243102022459. The reversal of 243102022421 is 124220201342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185835139396 + 57266883025 = 431086^2 + 239305^2 .

It is a cyclic number.

It is not a de Polignac number, because 243102022421 - 2⁶ = 243102022357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243102022021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121551011210 + 121551011211.

It is an arithmetic number, because the mean of its divisors is an integer number (121551011211).

Almost surely, 2^243102022421 is an apocalyptic number.

It is an amenable number.

243102022421 is a deficient number, since it is larger than the sum of its proper divisors (1).

243102022421 is an equidigital number, since it uses as much as digits as its factorization.

243102022421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 243102022421 its reverse (124220201342), we get a palindrome (367322223763).

The spelling of 243102022421 in words is "two hundred forty-three billion, one hundred two million, twenty-two thousand, four hundred twenty-one".