42577021 has 2 divisors, whose sum is σ = 42577022. Its totient is φ = 42577020.

The previous prime is 42577013. The next prime is 42577037. The reversal of 42577021 is 12077524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28783225 + 13793796 = 5365^2 + 3714^2 .

It is a cyclic number.

It is not a de Polignac number, because 42577021 - 2³ = 42577013 is a prime.

It is equal to p_2580553 and since 42577021 and 2580553 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42577001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21288510 + 21288511.

It is an arithmetic number, because the mean of its divisors is an integer number (21288511).

Almost surely, 2^42577021 is an apocalyptic number.

It is an amenable number.

42577021 is a deficient number, since it is larger than the sum of its proper divisors (1).

42577021 is an equidigital number, since it uses as much as digits as its factorization.

42577021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 42577021 is about 6525.1069723032. The cubic root of 42577021 is about 349.1872871005.

The spelling of 42577021 in words is "forty-two million, five hundred seventy-seven thousand, twenty-one".