21520002223305 has 24 divisors (see below), whose sum is σ = 37933563245760. Its totient is φ = 11282803424160.

The previous prime is 21520002223303. The next prime is 21520002223333. The reversal of 21520002223305 is 50332220002512.

It is not a de Polignac number, because 21520002223305 - 2¹ = 21520002223303 is a prime.

It is a super-2 number, since 2×21520002223305² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21520002223303) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4052728461 + ... + 4052733770.

It is an arithmetic number, because the mean of its divisors is an integer number (1580565135240).

Almost surely, 2^{21520002223305} is an apocalyptic number.

It is an amenable number.

21520002223305 is a deficient number, since it is larger than the sum of its proper divisors (16413561022455).

21520002223305 is a wasteful number, since it uses less digits than its factorization.

21520002223305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8105462301 (or 8105462298 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21520002223305 its reverse (50332220002512), we get a palindrome (71852222225817).

The spelling of 21520002223305 in words is "twenty-one trillion, five hundred twenty billion, two million, two hundred twenty-three thousand, three hundred five".