202421423 has 4 divisors (see below), whose sum is σ = 204313320. Its totient is φ = 200529528.

The previous prime is 202421411. The next prime is 202421437. The reversal of 202421423 is 324124202.

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

It is a cyclic number.

It is not a de Polignac number, because 202421423 - 2²⁶ = 135312559 is a prime.

It is a super-3 number, since 3×202421423³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202421395 and 202421404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202421123) 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, 945788 + ... + 946001.

It is an arithmetic number, because the mean of its divisors is an integer number (51078330).

Almost surely, 2^202421423 is an apocalyptic number.

202421423 is a deficient number, since it is larger than the sum of its proper divisors (1891897).

202421423 is a wasteful number, since it uses less digits than its factorization.

202421423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891896.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 202421423 is about 14227.4882885209. The cubic root of 202421423 is about 587.1541811501.

Adding to 202421423 its reverse (324124202), we get a palindrome (526545625).

The spelling of 202421423 in words is "two hundred two million, four hundred twenty-one thousand, four hundred twenty-three".