42021165 has 16 divisors (see below), whose sum is σ = 67507776. Its totient is φ = 22320000.

The previous prime is 42021143. The next prime is 42021173. The reversal of 42021165 is 56112024.

It is not a de Polignac number, because 42021165 - 2⁷ = 42021037 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1816 + ... + 9345.

It is an arithmetic number, because the mean of its divisors is an integer number (4219236).

Almost surely, 2^42021165 is an apocalyptic number.

It is an amenable number.

42021165 is a deficient number, since it is larger than the sum of its proper divisors (25486611).

42021165 is a wasteful number, since it uses less digits than its factorization.

42021165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11420.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 42021165 is about 6482.3734079425. The cubic root of 42021165 is about 347.6610436548.

Adding to 42021165 its reverse (56112024), we get a palindrome (98133189).

The spelling of 42021165 in words is "forty-two million, twenty-one thousand, one hundred sixty-five".