21520444010010 has 128 divisors (see below), whose sum is σ = 56694672921600. Its totient is φ = 5184684433920.

The previous prime is 21520444009993. The next prime is 21520444010029. The reversal of 21520444010010 is 1001044402512.

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, 94930417 + ... + 95156843.

It is an arithmetic number, because the mean of its divisors is an integer number (442927132200).

Almost surely, 2^{21520444010010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21520444010010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28347336460800).

21520444010010 is an abundant number, since it is smaller than the sum of its proper divisors (35174228911590).

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

21520444010010 is a wasteful number, since it uses less digits than its factorization.

21520444010010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228236.

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 21520444010010 its reverse (1001044402512), we get a palindrome (22521488412522).

The spelling of 21520444010010 in words is "twenty-one trillion, five hundred twenty billion, four hundred forty-four million, ten thousand, ten".