42120641 has 4 divisors (see below), whose sum is σ = 42198192. Its totient is φ = 42043092.

The previous prime is 42120623. The next prime is 42120647. The reversal of 42120641 is 14602124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42120641 - 2¹⁸ = 41858497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42120647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37955 + ... + 39048.

It is an arithmetic number, because the mean of its divisors is an integer number (10549548).

Almost surely, 2^42120641 is an apocalyptic number.

It is an amenable number.

42120641 is a deficient number, since it is larger than the sum of its proper divisors (77551).

42120641 is an equidigital number, since it uses as much as digits as its factorization.

42120641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77550.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 42120641 is about 6490.0416793731. The cubic root of 42120641 is about 347.9351648493.

Adding to 42120641 its reverse (14602124), we get a palindrome (56722765).

The spelling of 42120641 in words is "forty-two million, one hundred twenty thousand, six hundred forty-one".