42321091 has 2 divisors, whose sum is σ = 42321092. Its totient is φ = 42321090.

The previous prime is 42321089. The next prime is 42321101. The reversal of 42321091 is 19012324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42321091 - 2¹ = 42321089 is a prime.

Together with 42321089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42321491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21160545 + 21160546.

It is an arithmetic number, because the mean of its divisors is an integer number (21160546).

Almost surely, 2^42321091 is an apocalyptic number.

42321091 is a deficient number, since it is larger than the sum of its proper divisors (1).

42321091 is an equidigital number, since it uses as much as digits as its factorization.

42321091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 42321091 is about 6505.4662400169. The cubic root of 42321091 is about 348.4862268962.

The spelling of 42321091 in words is "forty-two million, three hundred twenty-one thousand, ninety-one".