21530350445142 has 128 divisors (see below), whose sum is σ = 57889985126400. Its totient is φ = 5168748499200.

The previous prime is 21530350445081. The next prime is 21530350445147. The reversal of 21530350445142 is 24154405303512.

It is a self number, because there is not a number n which added to its sum of digits gives 21530350445142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530350445147) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29551842 + ... + 30271637.

It is an arithmetic number, because the mean of its divisors is an integer number (452265508800).

Almost surely, 2^{21530350445142} is an apocalyptic number.

21530350445142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21530350445142 is an abundant number, since it is smaller than the sum of its proper divisors (36359634681258).

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

21530350445142 is a wasteful number, since it uses less digits than its factorization.

21530350445142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59823562.

The product of its (nonzero) digits is 288000, while the sum is 39.

Adding to 21530350445142 its reverse (24154405303512), we get a palindrome (45684755748654).

The spelling of 21530350445142 in words is "twenty-one trillion, five hundred thirty billion, three hundred fifty million, four hundred forty-five thousand, one hundred forty-two".