42121154 has 8 divisors (see below), whose sum is σ = 63405840. Its totient is φ = 20985876.

The previous prime is 42121153. The next prime is 42121181. The reversal of 42121154 is 45112124.

It is a happy number.

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

It is a super-2 number, since 2×42121154² = 3548383228583432, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42121151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36644 + ... + 37775.

It is an arithmetic number, because the mean of its divisors is an integer number (7925730).

Almost surely, 2^42121154 is an apocalyptic number.

42121154 is a deficient number, since it is larger than the sum of its proper divisors (21284686).

42121154 is a wasteful number, since it uses less digits than its factorization.

42121154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74704.

The product of its digits is 320, while the sum is 20.

The square root of 42121154 is about 6490.0812013410. The cubic root of 42121154 is about 347.9365773793.

Adding to 42121154 its reverse (45112124), we get a palindrome (87233278).

The spelling of 42121154 in words is "forty-two million, one hundred twenty-one thousand, one hundred fifty-four".