42211121 has 4 divisors (see below), whose sum is σ = 42227952. Its totient is φ = 42194292.

The previous prime is 42211111. The next prime is 42211129. The reversal of 42211121 is 12111224.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42211121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42211096 and 42211105.

It is not an unprimeable number, because it can be changed into a prime (42211129) 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, 3815 + ... + 9948.

It is an arithmetic number, because the mean of its divisors is an integer number (10556988).

Almost surely, 2^42211121 is an apocalyptic number.

It is an amenable number.

42211121 is a deficient number, since it is larger than the sum of its proper divisors (16831).

42211121 is a wasteful number, since it uses less digits than its factorization.

42211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16830.

The product of its digits is 32, while the sum is 14.

The square root of 42211121 is about 6497.0086193571. The cubic root of 42211121 is about 348.1841216402.

Adding to 42211121 its reverse (12111224), we get a palindrome (54322345).

The spelling of 42211121 in words is "forty-two million, two hundred eleven thousand, one hundred twenty-one".