21513051240330 has 128 divisors (see below), whose sum is σ = 56160395698176. Its totient is φ = 5242444416000.

The previous prime is 21513051240313. The next prime is 21513051240361. The reversal of 21513051240330 is 3304215031512.

It is a super-2 number, since 2×21513051240330² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 372639927 + ... + 372697653.

It is an arithmetic number, because the mean of its divisors is an integer number (438753091392).

Almost surely, 2^{21513051240330} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21513051240330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28080197849088).

21513051240330 is an abundant number, since it is smaller than the sum of its proper divisors (34647344457846).

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

21513051240330 is a wasteful number, since it uses less digits than its factorization.

21513051240330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67312.

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 21513051240330 its reverse (3304215031512), we get a palindrome (24817266271842).

The spelling of 21513051240330 in words is "twenty-one trillion, five hundred thirteen billion, fifty-one million, two hundred forty thousand, three hundred thirty".