204021240423 has 128 divisors (see below), whose sum is σ = 388053227520. Its totient is φ = 91904440320.

The previous prime is 204021240403. The next prime is 204021240487. The reversal of 204021240423 is 324042120402.

It is not a de Polignac number, because 204021240423 - 2¹² = 204021236327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204021240393 and 204021240402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204021240403) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3190561 + ... + 3253877.

It is an arithmetic number, because the mean of its divisors is an integer number (3031665840).

Almost surely, 2^204021240423 is an apocalyptic number.

204021240423 is a deficient number, since it is larger than the sum of its proper divisors (184031987097).

204021240423 is a wasteful number, since it uses less digits than its factorization.

204021240423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63417.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 204021240423 its reverse (324042120402), we get a palindrome (528063360825).

It can be divided in two parts, 204021 and 240423, that added together give a palindrome (444444).

The spelling of 204021240423 in words is "two hundred four billion, twenty-one million, two hundred forty thousand, four hundred twenty-three".