202423421 has 2 divisors, whose sum is σ = 202423422. Its totient is φ = 202423420.

The previous prime is 202423409. The next prime is 202423423. The reversal of 202423421 is 124324202.

202423421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137217796 + 65205625 = 11714^2 + 8075^2 .

It is a cyclic number.

It is not a de Polignac number, because 202423421 - 2¹⁰ = 202422397 is a prime.

It is a Sophie Germain prime.

Together with 202423423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202423393 and 202423402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202423423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101211710 + 101211711.

It is an arithmetic number, because the mean of its divisors is an integer number (101211711).

Almost surely, 2^202423421 is an apocalyptic number.

It is an amenable number.

202423421 is a deficient number, since it is larger than the sum of its proper divisors (1).

202423421 is an equidigital number, since it uses as much as digits as its factorization.

202423421 is an evil number, because the sum of its binary digits is even.

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

The square root of 202423421 is about 14227.5585045362. The cubic root of 202423421 is about 587.1561129782.

Adding to 202423421 its reverse (124324202), we get a palindrome (326747623).

The spelling of 202423421 in words is "two hundred two million, four hundred twenty-three thousand, four hundred twenty-one".