21510327356322 has 160 divisors (see below), whose sum is σ = 54117785776320. Its totient is φ = 5680332887040.

The previous prime is 21510327356321. The next prime is 21510327356389. The reversal of 21510327356322 is 22365372301512.

It is a super-2 number, since 2×21510327356322² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (21510327356321) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 10263898 + ... + 12180650.

It is an arithmetic number, because the mean of its divisors is an integer number (338236161102).

Almost surely, 2^{21510327356322} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21510327356322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27058892888160).

21510327356322 is an abundant number, since it is smaller than the sum of its proper divisors (32607458419998).

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

21510327356322 is a wasteful number, since it uses less digits than its factorization.

21510327356322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916846 (or 1916825 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 42.

Adding to 21510327356322 its reverse (22365372301512), we get a palindrome (43875699657834).

The spelling of 21510327356322 in words is "twenty-one trillion, five hundred ten billion, three hundred twenty-seven million, three hundred fifty-six thousand, three hundred twenty-two".