4236205516421 has 2 divisors, whose sum is σ = 4236205516422. Its totient is φ = 4236205516420.

The previous prime is 4236205516327. The next prime is 4236205516471. The reversal of 4236205516421 is 1246155026324.

4236205516421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4219577413921 + 16628102500 = 2054161^2 + 128950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4236205516421 is a prime.

It is a super-2 number, since 2×4236205516421² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4236205516471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2118102758210 + 2118102758211.

It is an arithmetic number, because the mean of its divisors is an integer number (2118102758211).

Almost surely, 2^{4236205516421} is an apocalyptic number.

It is an amenable number.

4236205516421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4236205516421 is an equidigital number, since it uses as much as digits as its factorization.

4236205516421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 4236205516421 in words is "four trillion, two hundred thirty-six billion, two hundred five million, five hundred sixteen thousand, four hundred twenty-one".