21513051505330 has 64 divisors (see below), whose sum is σ = 48298455159552. Its totient is φ = 6702614634240.

The previous prime is 21513051505249. The next prime is 21513051505333. The reversal of 21513051505330 is 3350515031512.

It is a super-2 number, since 2×21513051505330² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21513051505333) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3855769 + ... + 7608748.

It is an arithmetic number, because the mean of its divisors is an integer number (754663361868).

Almost surely, 2^{21513051505330} is an apocalyptic number.

21513051505330 is an abundant number, since it is smaller than the sum of its proper divisors (26785403654222).

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

21513051505330 is a wasteful number, since it uses less digits than its factorization.

21513051505330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11466979.

The product of its (nonzero) digits is 33750, while the sum is 34.

Adding to 21513051505330 its reverse (3350515031512), we get a palindrome (24863566536842).

The spelling of 21513051505330 in words is "twenty-one trillion, five hundred thirteen billion, fifty-one million, five hundred five thousand, three hundred thirty".