42121616 has 10 divisors (see below), whose sum is σ = 81610662. Its totient is φ = 21060800.

The previous prime is 42121603. The next prime is 42121621. The reversal of 42121616 is 61612124.

It can be written as a sum of positive squares in only one way, i.e., 34810000 + 7311616 = 5900^2 + 2704^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42121591 and 42121600.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1316285 + ... + 1316316.

Almost surely, 2^42121616 is an apocalyptic number.

It is an amenable number.

42121616 is a deficient number, since it is larger than the sum of its proper divisors (39489046).

42121616 is a wasteful number, since it uses less digits than its factorization.

42121616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632609 (or 2632603 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 42121616 is about 6490.1167940184. The cubic root of 42121616 is about 347.9378494726.

The spelling of 42121616 in words is "forty-two million, one hundred twenty-one thousand, six hundred sixteen".