21362256 has 60 divisors (see below), whose sum is σ = 60377460. Its totient is φ = 7050240.

The previous prime is 21362227. The next prime is 21362269. The reversal of 21362256 is 65226312.

It can be written as a sum of positive squares in 2 ways, for example, as 9000000 + 12362256 = 3000^2 + 3516^2 .

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, 15016 + ... + 16376.

It is an arithmetic number, because the mean of its divisors is an integer number (1006291).

Almost surely, 2^21362256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21362256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30188730).

21362256 is an abundant number, since it is smaller than the sum of its proper divisors (39015204).

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

21362256 is a wasteful number, since it uses less digits than its factorization.

21362256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484 (or 1475 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 21362256 is about 4621.9320635423. The cubic root of 21362256 is about 277.4697897475.

Adding to 21362256 its reverse (65226312), we get a palindrome (86588568).

The spelling of 21362256 in words is "twenty-one million, three hundred sixty-two thousand, two hundred fifty-six".