21521344221150 has 96 divisors (see below), whose sum is σ = 53890074147840. Its totient is φ = 5683685345280.

The previous prime is 21521344221149. The next prime is 21521344221173. The reversal of 21521344221150 is 5112244312512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4789041 + ... + 8122659.

It is an arithmetic number, because the mean of its divisors is an integer number (561354939040).

Almost surely, 2^{21521344221150} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21521344221150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26945037073920).

21521344221150 is an abundant number, since it is smaller than the sum of its proper divisors (32368729926690).

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

21521344221150 is a wasteful number, since it uses less digits than its factorization.

21521344221150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334050 (or 3334045 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 21521344221150 its reverse (5112244312512), we get a palindrome (26633588533662).

The spelling of 21521344221150 in words is "twenty-one trillion, five hundred twenty-one billion, three hundred forty-four million, two hundred twenty-one thousand, one hundred fifty".