21510285160 has 128 divisors (see below), whose sum is σ = 60146311680. Its totient is φ = 6741439488.

The previous prime is 21510285151. The next prime is 21510285163. The reversal of 21510285160 is 6158201512.

It is not an unprimeable number, because it can be changed into a prime (21510285163) 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, 346234 + ... + 403606.

It is an arithmetic number, because the mean of its divisors is an integer number (469893060).

Almost surely, 2^21510285160 is an apocalyptic number.

21510285160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21510285160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30073155840).

21510285160 is an abundant number, since it is smaller than the sum of its proper divisors (38636026520).

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

21510285160 is a wasteful number, since it uses less digits than its factorization.

21510285160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57507 (or 57503 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 31.

Adding to 21510285160 its reverse (6158201512), we get a palindrome (27668486672).

The spelling of 21510285160 in words is "twenty-one billion, five hundred ten million, two hundred eighty-five thousand, one hundred sixty".