204220244421 has 12 divisors (see below), whose sum is σ = 294990816172. Its totient is φ = 136144051776.

The previous prime is 204220244419. The next prime is 204220244447. The reversal of 204220244421 is 124442022402.

It can be written as a sum of positive squares in 2 ways, for example, as 146926556100 + 57293688321 = 383310^2 + 239361^2 .

It is not a de Polignac number, because 204220244421 - 2¹ = 204220244419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204220244471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 297825 + ... + 705081.

Almost surely, 2^204220244421 is an apocalyptic number.

It is an amenable number.

204220244421 is a deficient number, since it is larger than the sum of its proper divisors (90770571751).

204220244421 is a wasteful number, since it uses less digits than its factorization.

204220244421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462980 (or 462977 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 27.

Adding to 204220244421 its reverse (124442022402), we get a palindrome (328662266823).

The spelling of 204220244421 in words is "two hundred four billion, two hundred twenty million, two hundred forty-four thousand, four hundred twenty-one".