21062256 has 40 divisors (see below), whose sum is σ = 54579840. Its totient is φ = 6998976.

The previous prime is 21062219. The next prime is 21062257. The reversal of 21062256 is 65226012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21062257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24685 + ... + 25523.

It is an arithmetic number, because the mean of its divisors is an integer number (1364496).

Almost surely, 2^21062256 is an apocalyptic number.

It is an amenable number.

21062256 is an abundant number, since it is smaller than the sum of its proper divisors (33517584).

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

21062256 is a wasteful number, since it uses less digits than its factorization.

21062256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373 (or 1367 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21062256 is about 4589.3633545406. The cubic root of 21062256 is about 276.1647829259.

Adding to 21062256 its reverse (65226012), we get a palindrome (86288268).

The spelling of 21062256 in words is "twenty-one million, sixty-two thousand, two hundred fifty-six".