21428854 has 16 divisors (see below), whose sum is σ = 33883920. Its totient is φ = 10148320.

The previous prime is 21428831. The next prime is 21428861. The reversal of 21428854 is 45882412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 412 + ... + 6559.

It is an arithmetic number, because the mean of its divisors is an integer number (2117745).

Almost surely, 2^21428854 is an apocalyptic number.

21428854 is a deficient number, since it is larger than the sum of its proper divisors (12455066).

21428854 is a wasteful number, since it uses less digits than its factorization.

21428854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7055.

The product of its digits is 20480, while the sum is 34.

The square root of 21428854 is about 4629.1310199648. The cubic root of 21428854 is about 277.7578330332.

The spelling of 21428854 in words is "twenty-one million, four hundred twenty-eight thousand, eight hundred fifty-four".