42121478 has 48 divisors (see below), whose sum is σ = 78821424. Its totient is φ = 16773120.

The previous prime is 42121477. The next prime is 42121481. The reversal of 42121478 is 87412124.

It is a self number, because there is not a number n which added to its sum of digits gives 42121478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42121477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 218150 + ... + 218342.

It is an arithmetic number, because the mean of its divisors is an integer number (1642113).

Almost surely, 2^42121478 is an apocalyptic number.

42121478 is a deficient number, since it is larger than the sum of its proper divisors (36699946).

42121478 is a wasteful number, since it uses less digits than its factorization.

42121478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 350 counting only the distinct ones).

The product of its digits is 3584, while the sum is 29.

The square root of 42121478 is about 6490.1061624599. The cubic root of 42121478 is about 347.9374694977.

The spelling of 42121478 in words is "forty-two million, one hundred twenty-one thousand, four hundred seventy-eight".