204430421550 has 96 divisors (see below), whose sum is σ = 520078141440. Its totient is φ = 53113536000.

The previous prime is 204430421497. The next prime is 204430421561. The reversal of 204430421550 is 55124034402.

It is a super-2 number, since 2×204430421550² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2546931 + ... + 2625969.

It is an arithmetic number, because the mean of its divisors is an integer number (5417480640).

Almost surely, 2^204430421550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204430421550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260039070720).

204430421550 is an abundant number, since it is smaller than the sum of its proper divisors (315647719890).

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

204430421550 is a wasteful number, since it uses less digits than its factorization.

204430421550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79498 (or 79493 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 204430421550 its reverse (55124034402), we get a palindrome (259554455952).

The spelling of 204430421550 in words is "two hundred four billion, four hundred thirty million, four hundred twenty-one thousand, five hundred fifty".