42204322421 has 2 divisors, whose sum is σ = 42204322422. Its totient is φ = 42204322420.

The previous prime is 42204322393. The next prime is 42204322469. The reversal of 42204322421 is 12422340224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31182262225 + 11022060196 = 176585^2 + 104986^2 .

It is a cyclic number.

It is not a de Polignac number, because 42204322421 - 2³⁰ = 41130580597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42204327421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21102161210 + 21102161211.

It is an arithmetic number, because the mean of its divisors is an integer number (21102161211).

Almost surely, 2^42204322421 is an apocalyptic number.

It is an amenable number.

42204322421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42204322421 is an equidigital number, since it uses as much as digits as its factorization.

42204322421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 42204322421 its reverse (12422340224), we get a palindrome (54626662645).

The spelling of 42204322421 in words is "forty-two billion, two hundred four million, three hundred twenty-two thousand, four hundred twenty-one".