4243212024421 has 2 divisors, whose sum is σ = 4243212024422. Its totient is φ = 4243212024420.

The previous prime is 4243212024419. The next prime is 4243212024433. The reversal of 4243212024421 is 1244202123424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4115826562500 + 127385461921 = 2028750^2 + 356911^2 .

It is a cyclic number.

It is not a de Polignac number, because 4243212024421 - 2¹ = 4243212024419 is a prime.

It is a super-2 number, since 2×4243212024421² (a number of 26 digits) contains 22 as substring.

Together with 4243212024419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4243212024721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121606012210 + 2121606012211.

It is an arithmetic number, because the mean of its divisors is an integer number (2121606012211).

Almost surely, 2^{4243212024421} is an apocalyptic number.

It is an amenable number.

4243212024421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243212024421 is an equidigital number, since it uses as much as digits as its factorization.

4243212024421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 4243212024421 its reverse (1244202123424), we get a palindrome (5487414147845).

The spelling of 4243212024421 in words is "four trillion, two hundred forty-three billion, two hundred twelve million, twenty-four thousand, four hundred twenty-one".