21160260 has 72 divisors (see below), whose sum is σ = 70027776. Its totient is φ = 5129280.

The previous prime is 21160231. The next prime is 21160261. The reversal of 21160260 is 6206112.

It is a happy number.

21160260 is a `hidden beast` number, since 2 + 1 + 1 + 602 + 60 = 666.

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 (21160261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3364 + ... + 7323.

It is an arithmetic number, because the mean of its divisors is an integer number (972608).

Almost surely, 2^21160260 is an apocalyptic number.

21160260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21160260 is an abundant number, since it is smaller than the sum of its proper divisors (48867516).

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

21160260 is a wasteful number, since it uses less digits than its factorization.

21160260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10713 (or 10708 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21160260 is about 4600.0282607828. The cubic root of 21160260 is about 276.5924576377.

Adding to 21160260 its reverse (6206112), we get a palindrome (27366372).

The spelling of 21160260 in words is "twenty-one million, one hundred sixty thousand, two hundred sixty".