204021240402 has 64 divisors (see below), whose sum is σ = 467560387584. Its totient is φ = 58138689600.

The previous prime is 204021240383. The next prime is 204021240403. The reversal of 204021240402 is 204042120402.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 31 ways as a sum of consecutive naturals, for example, 43863777 + ... + 43868427.

It is an arithmetic number, because the mean of its divisors is an integer number (7305631056).

Almost surely, 2^204021240402 is an apocalyptic number.

204021240402 is an abundant number, since it is smaller than the sum of its proper divisors (263539147182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204021240402 is a wasteful number, since it uses less digits than its factorization.

204021240402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7183.

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 204021240402 its reverse (204042120402), we get a palindrome (408063360804).

The spelling of 204021240402 in words is "two hundred four billion, twenty-one million, two hundred forty thousand, four hundred two".