421129 has 4 divisors (see below), whose sum is σ = 422676. Its totient is φ = 419584.

The previous prime is 421123. The next prime is 421133. The reversal of 421129 is 921124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 193600 + 227529 = 440^2 + 477^2 .

It is a cyclic number.

It is not a de Polignac number, because 421129 - 2³ = 421121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421121) 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, 244 + ... + 949.

It is an arithmetic number, because the mean of its divisors is an integer number (105669).

2⁴²¹¹²⁹ is an apocalyptic number.

It is an amenable number.

421129 is a deficient number, since it is larger than the sum of its proper divisors (1547).

421129 is a wasteful number, since it uses less digits than its factorization.

421129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546.

The product of its digits is 144, while the sum is 19.

The square root of 421129 is about 648.9445276755. The cubic root of 421129 is about 74.9557665097.

The spelling of 421129 in words is "four hundred twenty-one thousand, one hundred twenty-nine".