21246256 has 40 divisors (see below), whose sum is σ = 44282880. Its totient is φ = 9843264.

The previous prime is 21246229. The next prime is 21246263. The reversal of 21246256 is 65264212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13545 + ... + 15031.

It is an arithmetic number, because the mean of its divisors is an integer number (1107072).

Almost surely, 2^21246256 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 21246256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22141440).

21246256 is an abundant number, since it is smaller than the sum of its proper divisors (23036624).

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

21246256 is a wasteful number, since it uses less digits than its factorization.

21246256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561 (or 1555 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 21246256 is about 4609.3661169406. The cubic root of 21246256 is about 276.9666448387.

The spelling of 21246256 in words is "twenty-one million, two hundred forty-six thousand, two hundred fifty-six".