42321089 has 2 divisors, whose sum is σ = 42321090. Its totient is φ = 42321088.

The previous prime is 42321079. The next prime is 42321091. The reversal of 42321089 is 98012324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36096064 + 6225025 = 6008^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 42321089 - 2¹⁶ = 42255553 is a prime.

Together with 42321091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42321029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21160544 + 21160545.

It is an arithmetic number, because the mean of its divisors is an integer number (21160545).

Almost surely, 2^42321089 is an apocalyptic number.

It is an amenable number.

42321089 is a deficient number, since it is larger than the sum of its proper divisors (1).

42321089 is an equidigital number, since it uses as much as digits as its factorization.

42321089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 42321089 is about 6505.4660863000. The cubic root of 42321089 is about 348.4862214067.

It can be divided in two parts, 423 and 21089, that added together give a palindrome (21512).

The spelling of 42321089 in words is "forty-two million, three hundred twenty-one thousand, eighty-nine".