42321571 has 2 divisors, whose sum is σ = 42321572. Its totient is φ = 42321570.

The previous prime is 42321563. The next prime is 42321581. The reversal of 42321571 is 17512324.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42321571 - 2³ = 42321563 is a prime.

It is a super-2 number, since 2×42321571² = 3582230743816082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42321511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21160785 + 21160786.

It is an arithmetic number, because the mean of its divisors is an integer number (21160786).

Almost surely, 2^42321571 is an apocalyptic number.

42321571 is a deficient number, since it is larger than the sum of its proper divisors (1).

42321571 is an equidigital number, since it uses as much as digits as its factorization.

42321571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 25.

The square root of 42321571 is about 6505.5031319645. The cubic root of 42321571 is about 348.4875443856.

Adding to 42321571 its reverse (17512324), we get a palindrome (59833895).

The spelling of 42321571 in words is "forty-two million, three hundred twenty-one thousand, five hundred seventy-one".