21520530040350 has 96 divisors (see below), whose sum is σ = 58229214984576. Its totient is φ = 5216524790400.

The previous prime is 21520530040349. The next prime is 21520530040403. The reversal of 21520530040350 is 5304003502512.

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, 14396877 + ... + 15821223.

It is an arithmetic number, because the mean of its divisors is an integer number (606554322756).

Almost surely, 2^{21520530040350} is an apocalyptic number.

21520530040350 is an abundant number, since it is smaller than the sum of its proper divisors (36708684944226).

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

21520530040350 is a wasteful number, since it uses less digits than its factorization.

21520530040350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433530 (or 1433525 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 21520530040350 its reverse (5304003502512), we get a palindrome (26824533542862).

The spelling of 21520530040350 in words is "twenty-one trillion, five hundred twenty billion, five hundred thirty million, forty thousand, three hundred fifty".