42561121 has 8 divisors (see below), whose sum is σ = 45214400. Its totient is φ = 39949200.

The previous prime is 42561091. The next prime is 42561131. The reversal of 42561121 is 12116524.

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

It is a cyclic number.

It is not a de Polignac number, because 42561121 - 2⁵ = 42561089 is a prime.

It is a super-2 number, since 2×42561121² = 3622898041553282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42561092 and 42561101.

It is not an unprimeable number, because it can be changed into a prime (42561131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8205 + ... + 12346.

It is an arithmetic number, because the mean of its divisors is an integer number (5651800).

Almost surely, 2^42561121 is an apocalyptic number.

It is an amenable number.

42561121 is a deficient number, since it is larger than the sum of its proper divisors (2653279).

42561121 is a wasteful number, since it uses less digits than its factorization.

42561121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20679.

The product of its digits is 480, while the sum is 22.

The square root of 42561121 is about 6523.8884877042. Note that the first 3 decimals coincide. The cubic root of 42561121 is about 349.1438147532.

Adding to 42561121 its reverse (12116524), we get a palindrome (54677645).

The spelling of 42561121 in words is "forty-two million, five hundred sixty-one thousand, one hundred twenty-one".