202421100423 has 4 divisors (see below), whose sum is σ = 269894800568. Its totient is φ = 134947400280.

The previous prime is 202421100421. The next prime is 202421100433. The reversal of 202421100423 is 324001124202.

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

It is not a de Polignac number, because 202421100423 - 2¹ = 202421100421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202421100423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202421100421) 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, 33736850068 + ... + 33736850073.

It is an arithmetic number, because the mean of its divisors is an integer number (67473700142).

Almost surely, 2^202421100423 is an apocalyptic number.

202421100423 is a deficient number, since it is larger than the sum of its proper divisors (67473700145).

202421100423 is an equidigital number, since it uses as much as digits as its factorization.

202421100423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67473700144.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 202421100423 its reverse (324001124202), we get a palindrome (526422224625).

The spelling of 202421100423 in words is "two hundred two billion, four hundred twenty-one million, one hundred thousand, four hundred twenty-three".