21450854 has 8 divisors (see below), whose sum is σ = 32656728. Its totient is φ = 10565280.

The previous prime is 21450839. The next prime is 21450859. The reversal of 21450854 is 45805412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450859) 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 3 ways as a sum of consecutive naturals, for example, 79907 + ... + 80174.

It is an arithmetic number, because the mean of its divisors is an integer number (4082091).

Almost surely, 2^21450854 is an apocalyptic number.

21450854 is a deficient number, since it is larger than the sum of its proper divisors (11205874).

21450854 is a wasteful number, since it uses less digits than its factorization.

21450854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160150.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 21450854 is about 4631.5066663020. The cubic root of 21450854 is about 277.8528541721.

The spelling of 21450854 in words is "twenty-one million, four hundred fifty thousand, eight hundred fifty-four".