21454256 has 10 divisors (see below), whose sum is σ = 41567652. Its totient is φ = 10727120.

The previous prime is 21454253. The next prime is 21454261. The reversal of 21454256 is 65245412.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21454253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670430 + ... + 670461.

Almost surely, 2^21454256 is an apocalyptic number.

It is an amenable number.

21454256 is a deficient number, since it is larger than the sum of its proper divisors (20113396).

21454256 is a wasteful number, since it uses less digits than its factorization.

21454256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340899 (or 1340893 counting only the distinct ones).

The product of its digits is 9600, while the sum is 29.

The square root of 21454256 is about 4631.8739188367. The cubic root of 21454256 is about 277.8675420946.

Adding to 21454256 its reverse (65245412), we get a palindrome (86699668).

The spelling of 21454256 in words is "twenty-one million, four hundred fifty-four thousand, two hundred fifty-six".