21363552442050 has 384 divisors, whose sum is σ = 68678577623040. Its totient is φ = 4267848268800.

The previous prime is 21363552442027. The next prime is 21363552442081. The reversal of 21363552442050 is 5024425536312.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 21363552441993 and 21363552442011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 482628219 + ... + 482672481.

It is an arithmetic number, because the mean of its divisors is an integer number (178850462560).

Almost surely, 2^{21363552442050} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21363552442050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34339288811520).

21363552442050 is an abundant number, since it is smaller than the sum of its proper divisors (47315025180990).

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

21363552442050 is a wasteful number, since it uses less digits than its factorization.

21363552442050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46178 (or 46173 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 42.

Adding to 21363552442050 its reverse (5024425536312), we get a palindrome (26387977978362).

The spelling of 21363552442050 in words is "twenty-one trillion, three hundred sixty-three billion, five hundred fifty-two million, four hundred forty-two thousand, fifty".