21260160 has 96 divisors (see below), whose sum is σ = 73433880. Its totient is φ = 5667840.

The previous prime is 21260153. The next prime is 21260171. The reversal of 21260160 is 6106212.

It is a happy number.

21260160 is a `hidden beast` number, since 2 + 1 + 2 + 601 + 60 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

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

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, 3915 + ... + 7605.

Almost surely, 2^21260160 is an apocalyptic number.

21260160 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 21260160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36716940).

21260160 is an abundant number, since it is smaller than the sum of its proper divisors (52173720).

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

21260160 is a wasteful number, since it uses less digits than its factorization.

21260160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3716 (or 3701 counting only the distinct ones).

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

The square root of 21260160 is about 4610.8741036814. The cubic root of 21260160 is about 277.0270492772.

Adding to 21260160 its reverse (6106212), we get a palindrome (27366372).

The spelling of 21260160 in words is "twenty-one million, two hundred sixty thousand, one hundred sixty".