42121908 has 36 divisors (see below), whose sum is σ = 106736448. Its totient is φ = 14006160.

The previous prime is 42121889. The next prime is 42121913. The reversal of 42121908 is 80912124.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16485 + ... + 18867.

Almost surely, 2^42121908 is an apocalyptic number.

It is an amenable number.

42121908 is an abundant number, since it is smaller than the sum of its proper divisors (64614540).

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

42121908 is a wasteful number, since it uses less digits than its factorization.

42121908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884 (or 2879 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 42121908 is about 6490.1392897225. The cubic root of 42121908 is about 347.9386534748.

The spelling of 42121908 in words is "forty-two million, one hundred twenty-one thousand, nine hundred eight".