21535230531450 has 24 divisors (see below), whose sum is σ = 53407371718368. Its totient is φ = 5742728141680.

The previous prime is 21535230531391. The next prime is 21535230531481. The reversal of 21535230531450 is 5413503253512.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21535230531399 and 21535230531408.

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 11 ways as a sum of consecutive naturals, for example, 71784101622 + ... + 71784101921.

It is an arithmetic number, because the mean of its divisors is an integer number (2225307154932).

Almost surely, 2^{21535230531450} is an apocalyptic number.

21535230531450 is an abundant number, since it is smaller than the sum of its proper divisors (31872141186918).

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

21535230531450 is a wasteful number, since it uses less digits than its factorization.

21535230531450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143568203558 (or 143568203553 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 39.

Adding to 21535230531450 its reverse (5413503253512), we get a palindrome (26948733784962).

The spelling of 21535230531450 in words is "twenty-one trillion, five hundred thirty-five billion, two hundred thirty million, five hundred thirty-one thousand, four hundred fifty".