21502360054434 has 64 divisors (see below), whose sum is σ = 51987668281344. Its totient is φ = 5795922439296.

The previous prime is 21502360054433. The next prime is 21502360054477. The reversal of 21502360054434 is 43445006320512.

It is a junction number, because it is equal to n+sod(n) for n = 21502360054392 and 21502360054401.

It is not an unprimeable number, because it can be changed into a prime (21502360054433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152389564 + ... + 152530599.

It is an arithmetic number, because the mean of its divisors is an integer number (812307316896).

Almost surely, 2^{21502360054434} is an apocalyptic number.

21502360054434 is an abundant number, since it is smaller than the sum of its proper divisors (30485308226910).

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

21502360054434 is a wasteful number, since it uses less digits than its factorization.

21502360054434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304920271.

The product of its (nonzero) digits is 345600, while the sum is 39.

Adding to 21502360054434 its reverse (43445006320512), we get a palindrome (64947366374946).

The spelling of 21502360054434 in words is "twenty-one trillion, five hundred two billion, three hundred sixty million, fifty-four thousand, four hundred thirty-four".