21262160 has 40 divisors (see below), whose sum is σ = 50256456. Its totient is φ = 8363520.

The previous prime is 21262147. The next prime is 21262183. The reversal of 21262160 is 6126212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3182656 + 18079504 = 1784^2 + 4252^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2702 + ... + 7058.

Almost surely, 2^21262160 is an apocalyptic number.

21262160 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 21262160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25128228).

21262160 is an abundant number, since it is smaller than the sum of its proper divisors (28994296).

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

21262160 is a wasteful number, since it uses less digits than its factorization.

21262160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4431 (or 4425 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21262160 is about 4611.0909771983. The cubic root of 21262160 is about 277.0357358961.

Adding to 21262160 its reverse (6126212), we get a palindrome (27388372).

The spelling of 21262160 in words is "twenty-one million, two hundred sixty-two thousand, one hundred sixty".