21160080 has 60 divisors (see below), whose sum is σ = 71065020. Its totient is φ = 5642496.

The previous prime is 21160079. The next prime is 21160081. The reversal of 21160080 is 8006112.

It is an interprime number because it is at equal distance from previous prime (21160079) and next prime (21160081).

It can be written as a sum of positive squares in 2 ways, for example, as 6780816 + 14379264 = 2604^2 + 3792^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21160081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13975 + ... + 15414.

It is an arithmetic number, because the mean of its divisors is an integer number (1184417).

Almost surely, 2^21160080 is an apocalyptic number.

21160080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21160080 is an abundant number, since it is smaller than the sum of its proper divisors (49904940).

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

21160080 is a wasteful number, since it uses less digits than its factorization.

21160080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29408 (or 29399 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 21160080 is about 4600.0086956440. The cubic root of 21160080 is about 276.5916733565.

Adding to 21160080 its reverse (8006112), we get a palindrome (29166192).

The spelling of 21160080 in words is "twenty-one million, one hundred sixty thousand, eighty".