421210121 has 8 divisors (see below), whose sum is σ = 424638144. Its totient is φ = 417790800.

The previous prime is 421210103. The next prime is 421210129. The reversal of 421210121 is 121012124.

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 421210121 - 2⁶ = 421210057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421210096 and 421210105.

It is not an unprimeable number, because it can be changed into a prime (421210129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123191 + ... + 126563.

It is an arithmetic number, because the mean of its divisors is an integer number (53079768).

Almost surely, 2^421210121 is an apocalyptic number.

It is an amenable number.

421210121 is a deficient number, since it is larger than the sum of its proper divisors (3428023).

421210121 is a wasteful number, since it uses less digits than its factorization.

421210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4351.

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

The square root of 421210121 is about 20523.4042254203. The cubic root of 421210121 is about 749.6057904644.

Adding to 421210121 its reverse (121012124), we get a palindrome (542222245).

The spelling of 421210121 in words is "four hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".