442421309221 has 2 divisors, whose sum is σ = 442421309222. Its totient is φ = 442421309220.

The previous prime is 442421309219. The next prime is 442421309261. The reversal of 442421309221 is 122903124244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394868964996 + 47552344225 = 628386^2 + 218065^2 .

It is a cyclic number.

It is not a de Polignac number, because 442421309221 - 2¹ = 442421309219 is a prime.

It is a super-2 number, since 2×442421309221² (a number of 24 digits) contains 22 as substring.

Together with 442421309219, 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 (442421309261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221210654610 + 221210654611.

It is an arithmetic number, because the mean of its divisors is an integer number (221210654611).

Almost surely, 2^442421309221 is an apocalyptic number.

It is an amenable number.

442421309221 is a deficient number, since it is larger than the sum of its proper divisors (1).

442421309221 is an equidigital number, since it uses as much as digits as its factorization.

442421309221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 442421309221 in words is "four hundred forty-two billion, four hundred twenty-one million, three hundred nine thousand, two hundred twenty-one".