42321397 has 2 divisors, whose sum is σ = 42321398. Its totient is φ = 42321396.

The previous prime is 42321371. The next prime is 42321413. The reversal of 42321397 is 79312324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27468081 + 14853316 = 5241^2 + 3854^2 .

It is a cyclic number.

It is not a de Polignac number, because 42321397 - 2⁷ = 42321269 is a prime.

It is a super-2 number, since 2×42321397² = 3582201288063218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42321337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21160698 + 21160699.

It is an arithmetic number, because the mean of its divisors is an integer number (21160699).

Almost surely, 2^42321397 is an apocalyptic number.

It is an amenable number.

42321397 is a deficient number, since it is larger than the sum of its proper divisors (1).

42321397 is an equidigital number, since it uses as much as digits as its factorization.

42321397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 31.

The square root of 42321397 is about 6505.4897586577. The cubic root of 42321397 is about 348.4870667968.

The spelling of 42321397 in words is "forty-two million, three hundred twenty-one thousand, three hundred ninety-seven".