21530352210345 has 128 divisors (see below), whose sum is σ = 43582778265600. Its totient is φ = 9982461772800.

The previous prime is 21530352210343. The next prime is 21530352210371. The reversal of 21530352210345 is 54301225303512.

21530352210345 is a `hidden beast` number, since 2 + 1 + 5 + 303 + 5 + 2 + 2 + 1 + 0 + 345 = 666.

It is not a de Polignac number, because 21530352210345 - 2¹ = 21530352210343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21530352210343) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 132747750 + ... + 132909840.

It is an arithmetic number, because the mean of its divisors is an integer number (340490455200).

Almost surely, 2^{21530352210345} is an apocalyptic number.

It is an amenable number.

21530352210345 is an abundant number, since it is smaller than the sum of its proper divisors (22052426055255).

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

21530352210345 is a wasteful number, since it uses less digits than its factorization.

21530352210345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166028 (or 166022 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 21530352210345 its reverse (54301225303512), we get a palindrome (75831577513857).

The spelling of 21530352210345 in words is "twenty-one trillion, five hundred thirty billion, three hundred fifty-two million, two hundred ten thousand, three hundred forty-five".