421001121 has 4 divisors (see below), whose sum is σ = 561334832. Its totient is φ = 280667412.

The previous prime is 421001099. The next prime is 421001123. The reversal of 421001121 is 121100124.

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 not a de Polignac number, because 421001121 - 2⁶ = 421001057 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 = 421001097 and 421001106.

It is not an unprimeable number, because it can be changed into a prime (421001123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70166851 + ... + 70166856.

It is an arithmetic number, because the mean of its divisors is an integer number (140333708).

Almost surely, 2^421001121 is an apocalyptic number.

It is an amenable number.

421001121 is a deficient number, since it is larger than the sum of its proper divisors (140333711).

421001121 is a wasteful number, since it uses less digits than its factorization.

421001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140333710.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 421001121 is about 20518.3118457635. The cubic root of 421001121 is about 749.4817878017.

Adding to 421001121 its reverse (121100124), we get a palindrome (542101245).

The spelling of 421001121 in words is "four hundred twenty-one million, one thousand, one hundred twenty-one".