204122003421 has 16 divisors (see below), whose sum is σ = 311876960384. Its totient is φ = 116328429504.

The previous prime is 204122003419. The next prime is 204122003429. The reversal of 204122003421 is 124300221402.

It is not a de Polignac number, because 204122003421 - 2¹ = 204122003419 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204122003429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13021786 + ... + 13037451.

It is an arithmetic number, because the mean of its divisors is an integer number (19492310024).

Almost surely, 2^204122003421 is an apocalyptic number.

204122003421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

204122003421 is a deficient number, since it is larger than the sum of its proper divisors (107754956963).

204122003421 is a wasteful number, since it uses less digits than its factorization.

204122003421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26059620.

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

Adding to 204122003421 its reverse (124300221402), we get a palindrome (328422224823).

The spelling of 204122003421 in words is "two hundred four billion, one hundred twenty-two million, three thousand, four hundred twenty-one".