42021016 has 8 divisors (see below), whose sum is σ = 78789420. Its totient is φ = 21010504.

The previous prime is 42020983. The next prime is 42021017. The reversal of 42021016 is 61012024.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42021017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626306 + ... + 2626321.

Almost surely, 2^42021016 is an apocalyptic number.

It is an amenable number.

42021016 is a deficient number, since it is larger than the sum of its proper divisors (36768404).

42021016 is a wasteful number, since it uses less digits than its factorization.

42021016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252633 (or 5252629 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 42021016 is about 6482.3619152281. The cubic root of 42021016 is about 347.6606327384.

The spelling of 42021016 in words is "forty-two million, twenty-one thousand, sixteen".