42621287 has 2 divisors, whose sum is σ = 42621288. Its totient is φ = 42621286.

The previous prime is 42621283. The next prime is 42621307. The reversal of 42621287 is 78212624.

42621287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42621287 - 2² = 42621283 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42621283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21310643 + 21310644.

It is an arithmetic number, because the mean of its divisors is an integer number (21310644).

Almost surely, 2^42621287 is an apocalyptic number.

42621287 is a deficient number, since it is larger than the sum of its proper divisors (1).

42621287 is an equidigital number, since it uses as much as digits as its factorization.

42621287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 32.

The square root of 42621287 is about 6528.4980661711. The cubic root of 42621287 is about 349.3082582285.

The spelling of 42621287 in words is "forty-two million, six hundred twenty-one thousand, two hundred eighty-seven".