42464021 has 2 divisors, whose sum is σ = 42464022. Its totient is φ = 42464020.

The previous prime is 42463979. The next prime is 42464041. The reversal of 42464021 is 12046424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42315025 + 148996 = 6505^2 + 386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42464021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42464041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21232010 + 21232011.

It is an arithmetic number, because the mean of its divisors is an integer number (21232011).

Almost surely, 2^42464021 is an apocalyptic number.

It is an amenable number.

42464021 is a deficient number, since it is larger than the sum of its proper divisors (1).

42464021 is an equidigital number, since it uses as much as digits as its factorization.

42464021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 42464021 is about 6516.4423576059. The cubic root of 42464021 is about 348.8780974517.

The spelling of 42464021 in words is "forty-two million, four hundred sixty-four thousand, twenty-one".