42856321 has 2 divisors, whose sum is σ = 42856322. Its totient is φ = 42856320.

The previous prime is 42856313. The next prime is 42856327. The reversal of 42856321 is 12365824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39828721 + 3027600 = 6311^2 + 1740^2 .

It is a cyclic number.

It is not a de Polignac number, because 42856321 - 2³ = 42856313 is a prime.

It is not a weakly prime, because it can be changed into another prime (42856327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21428160 + 21428161.

It is an arithmetic number, because the mean of its divisors is an integer number (21428161).

Almost surely, 2^42856321 is an apocalyptic number.

It is an amenable number.

42856321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42856321 is an equidigital number, since it uses as much as digits as its factorization.

42856321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 31.

The square root of 42856321 is about 6546.4739364027. The cubic root of 42856321 is about 349.9491654062.

The spelling of 42856321 in words is "forty-two million, eight hundred fifty-six thousand, three hundred twenty-one".