42021445 has 16 divisors (see below), whose sum is σ = 53239680. Its totient is φ = 31752000.

The previous prime is 42021401. The next prime is 42021509. The reversal of 42021445 is 54412024.

It is a happy number.

It is not a de Polignac number, because 42021445 - 2²¹ = 39924293 is a prime.

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, 59595 + ... + 60295.

It is an arithmetic number, because the mean of its divisors is an integer number (3327480).

Almost surely, 2^42021445 is an apocalyptic number.

It is an amenable number.

42021445 is a deficient number, since it is larger than the sum of its proper divisors (11218235).

42021445 is a wasteful number, since it uses less digits than its factorization.

42021445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 42021445 is about 6482.3950049345. The cubic root of 42021445 is about 347.6618158441.

Adding to 42021445 its reverse (54412024), we get a palindrome (96433469).

The spelling of 42021445 in words is "forty-two million, twenty-one thousand, four hundred forty-five".