21501160 has 48 divisors (see below), whose sum is σ = 51092100. Its totient is φ = 8142336.

The previous prime is 21501131. The next prime is 21501187. The reversal of 21501160 is 6110512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20448484 + 1052676 = 4522^2 + 1026^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13696 + ... + 15184.

Almost surely, 2^21501160 is an apocalyptic number.

21501160 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 21501160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25546050).

21501160 is an abundant number, since it is smaller than the sum of its proper divisors (29590940).

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

21501160 is a wasteful number, since it uses less digits than its factorization.

21501160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538 (or 1515 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 21501160 is about 4636.9343320776. The cubic root of 21501160 is about 278.0698890930.

Adding to 21501160 its reverse (6110512), we get a palindrome (27611672).

It can be divided in two parts, 215011 and 60, that multiplied together give a triangular number (12900660 = T₅₀₇₉).

The spelling of 21501160 in words is "twenty-one million, five hundred one thousand, one hundred sixty".