42121654 has 8 divisors (see below), whose sum is σ = 63741960. Its totient is φ = 20874336.

The previous prime is 42121643. The next prime is 42121661. The reversal of 42121654 is 45612124.

It is a happy number.

42121654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92964 + ... + 93415.

It is an arithmetic number, because the mean of its divisors is an integer number (7967745).

Almost surely, 2^42121654 is an apocalyptic number.

42121654 is a deficient number, since it is larger than the sum of its proper divisors (21620306).

42121654 is a wasteful number, since it uses less digits than its factorization.

42121654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186494.

The product of its digits is 1920, while the sum is 25.

The square root of 42121654 is about 6490.1197215460. The cubic root of 42121654 is about 347.9379541032.

Adding to 42121654 its reverse (45612124), we get a palindrome (87733778).

The spelling of 42121654 in words is "forty-two million, one hundred twenty-one thousand, six hundred fifty-four".