21004432350 has 288 divisors, whose sum is σ = 59048220672. Its totient is φ = 4935744000.

The previous prime is 21004432343. The next prime is 21004432373. The reversal of 21004432350 is 5323440012.

It is a self number, because there is not a number n which added to its sum of digits gives 21004432350.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 109970755 + ... + 109970945.

It is an arithmetic number, because the mean of its divisors is an integer number (205028544).

Almost surely, 2^21004432350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21004432350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29524110336).

21004432350 is an abundant number, since it is smaller than the sum of its proper divisors (38043788322).

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

21004432350 is a wasteful number, since it uses less digits than its factorization.

21004432350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 21004432350 its reverse (5323440012), we get a palindrome (26327872362).

It can be divided in two parts, 21004 and 432350, that added together give a palindrome (453354).

The spelling of 21004432350 in words is "twenty-one billion, four million, four hundred thirty-two thousand, three hundred fifty".