42121656 has 24 divisors (see below), whose sum is σ = 114079680. Its totient is φ = 14040528.

The previous prime is 42121643. The next prime is 42121661. The reversal of 42121656 is 65612124.

42121656 is a `hidden beast` number, since 4 + 2 + 1 + 2 + 1 + 656 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 292440 + ... + 292583.

It is an arithmetic number, because the mean of its divisors is an integer number (4753320).

Almost surely, 2^42121656 is an apocalyptic number.

It is an amenable number.

42121656 is an abundant number, since it is smaller than the sum of its proper divisors (71958024).

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

42121656 is a wasteful number, since it uses less digits than its factorization.

42121656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585035 (or 585028 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 42121656 is about 6490.1198756263. The cubic root of 42121656 is about 347.9379596101.

The spelling of 42121656 in words is "forty-two million, one hundred twenty-one thousand, six hundred fifty-six".