21501060216 has 64 divisors (see below), whose sum is σ = 57446599680. Its totient is φ = 6682375680.

The previous prime is 21501060181. The next prime is 21501060247. The reversal of 21501060216 is 61206010512.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202600 + ... + 289911.

It is an arithmetic number, because the mean of its divisors is an integer number (897603120).

Almost surely, 2^21501060216 is an apocalyptic number.

It is an amenable number.

21501060216 is an abundant number, since it is smaller than the sum of its proper divisors (35945539464).

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

21501060216 is a wasteful number, since it uses less digits than its factorization.

21501060216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492644 (or 492640 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 21501060216 its reverse (61206010512), we get a palindrome (82707070728).

The spelling of 21501060216 in words is "twenty-one billion, five hundred one million, sixty thousand, two hundred sixteen".