1423120421 has 4 divisors (see below), whose sum is σ = 1424089344. Its totient is φ = 1422151500.

The previous prime is 1423120411. The next prime is 1423120427. The reversal of 1423120421 is 1240213241.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1240213241 = 20219 ⋅61339.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1423120421 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 = 1423120393 and 1423120402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423120427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482255 + ... + 485196.

It is an arithmetic number, because the mean of its divisors is an integer number (356022336).

Almost surely, 2^1423120421 is an apocalyptic number.

It is an amenable number.

1423120421 is a deficient number, since it is larger than the sum of its proper divisors (968923).

1423120421 is an equidigital number, since it uses as much as digits as its factorization.

1423120421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968922.

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

The square root of 1423120421 is about 37724.2683295515. The cubic root of 1423120421 is about 1124.8135779330.

Adding to 1423120421 its reverse (1240213241), we get a palindrome (2663333662).

The spelling of 1423120421 in words is "one billion, four hundred twenty-three million, one hundred twenty thousand, four hundred twenty-one".