42021616 has 160 divisors (see below), whose sum is σ = 111104000. Its totient is φ = 15240960.

The previous prime is 42021613. The next prime is 42021641. The reversal of 42021616 is 61612024.

It is a super-2 number, since 2×42021616² = 3531632422502912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42021613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1355521 + ... + 1355551.

It is an arithmetic number, because the mean of its divisors is an integer number (694400).

Almost surely, 2^42021616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42021616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55552000).

42021616 is an abundant number, since it is smaller than the sum of its proper divisors (69082384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42021616 is a wasteful number, since it uses less digits than its factorization.

42021616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 42021616 is about 6482.4081944907. The cubic root of 42021616 is about 347.6622874294.

The spelling of 42021616 in words is "forty-two million, twenty-one thousand, six hundred sixteen".