21260854 has 16 divisors (see below), whose sum is σ = 33298560. Its totient is φ = 10169280.

The previous prime is 21260851. The next prime is 21260881. The reversal of 21260854 is 45806212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21260851) 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 7 ways as a sum of consecutive naturals, for example, 3592 + ... + 7444.

It is an arithmetic number, because the mean of its divisors is an integer number (2081160).

Almost surely, 2^21260854 is an apocalyptic number.

21260854 is a deficient number, since it is larger than the sum of its proper divisors (12037706).

21260854 is a wasteful number, since it uses less digits than its factorization.

21260854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3975.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21260854 is about 4610.9493599475. The cubic root of 21260854 is about 277.0300635957.

The spelling of 21260854 in words is "twenty-one million, two hundred sixty thousand, eight hundred fifty-four".