423421121 has 4 divisors (see below), whose sum is σ = 425068932. Its totient is φ = 421773312.

The previous prime is 423421093. The next prime is 423421127. The reversal of 423421121 is 121124324.

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 363436096 + 59985025 = 19064^2 + 7745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423421121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 423421093 and 423421102.

It is not an unprimeable number, because it can be changed into a prime (423421127) 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, 823520 + ... + 824033.

It is an arithmetic number, because the mean of its divisors is an integer number (106267233).

Almost surely, 2^423421121 is an apocalyptic number.

It is an amenable number.

423421121 is a deficient number, since it is larger than the sum of its proper divisors (1647811).

423421121 is a wasteful number, since it uses less digits than its factorization.

423421121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647810.

The product of its digits is 384, while the sum is 20.

The square root of 423421121 is about 20577.1990562370. The cubic root of 423421121 is about 750.9151028468.

Adding to 423421121 its reverse (121124324), we get a palindrome (544545445).

The spelling of 423421121 in words is "four hundred twenty-three million, four hundred twenty-one thousand, one hundred twenty-one".