42521383 has 2 divisors, whose sum is σ = 42521384. Its totient is φ = 42521382.

The previous prime is 42521371. The next prime is 42521389. The reversal of 42521383 is 38312524.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42521383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42521389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21260691 + 21260692.

It is an arithmetic number, because the mean of its divisors is an integer number (21260692).

Almost surely, 2^42521383 is an apocalyptic number.

42521383 is a deficient number, since it is larger than the sum of its proper divisors (1).

42521383 is an equidigital number, since it uses as much as digits as its factorization.

42521383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

The square root of 42521383 is about 6520.8422002070. The cubic root of 42521383 is about 349.0351193302.

The spelling of 42521383 in words is "forty-two million, five hundred twenty-one thousand, three hundred eighty-three".