21054456 has 48 divisors (see below), whose sum is σ = 58868160. Its totient is φ = 6791040.

The previous prime is 21054437. The next prime is 21054457. The reversal of 21054456 is 65445012.

21054456 is a `hidden beast` number, since 210 + 5 + 445 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054457) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2485 + ... + 6948.

It is an arithmetic number, because the mean of its divisors is an integer number (1226420).

Almost surely, 2^21054456 is an apocalyptic number.

It is an amenable number.

21054456 is an abundant number, since it is smaller than the sum of its proper divisors (37813704).

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

21054456 is a wasteful number, since it uses less digits than its factorization.

21054456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9476 (or 9469 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 21054456 is about 4588.5134847791. The cubic root of 21054456 is about 276.1306879510.

Adding to 21054456 its reverse (65445012), we get a palindrome (86499468).

It can be divided in two parts, 2105 and 4456, that added together give a 8-th power (6561 = 3⁸).

The spelling of 21054456 in words is "twenty-one million, fifty-four thousand, four hundred fifty-six".