42210121 has 8 divisors (see below), whose sum is σ = 42778944. Its totient is φ = 41644560.

The previous prime is 42210071. The next prime is 42210137. The reversal of 42210121 is 12101224.

It is a happy number.

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 42210121 - 2¹⁷ = 42079049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42210521) 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, 35151 + ... + 36331.

It is an arithmetic number, because the mean of its divisors is an integer number (5347368).

Almost surely, 2^42210121 is an apocalyptic number.

It is an amenable number.

42210121 is a deficient number, since it is larger than the sum of its proper divisors (568823).

42210121 is a wasteful number, since it uses less digits than its factorization.

42210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 42210121 is about 6496.9316604071. The cubic root of 42210121 is about 348.1813720736.

Adding to 42210121 its reverse (12101224), we get a palindrome (54311345).

The spelling of 42210121 in words is "forty-two million, two hundred ten thousand, one hundred twenty-one".