21222854 has 4 divisors (see below), whose sum is σ = 31834284. Its totient is φ = 10611426.

The previous prime is 21222847. The next prime is 21222913. The reversal of 21222854 is 45822212.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 5305712 + ... + 5305715.

It is an arithmetic number, because the mean of its divisors is an integer number (7958571).

Almost surely, 2^21222854 is an apocalyptic number.

21222854 is a deficient number, since it is larger than the sum of its proper divisors (10611430).

21222854 is a wasteful number, since it uses less digits than its factorization.

21222854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611429.

The product of its digits is 2560, while the sum is 26.

The square root of 21222854 is about 4606.8268906049. The cubic root of 21222854 is about 276.8649178235.

The spelling of 21222854 in words is "twenty-one million, two hundred twenty-two thousand, eight hundred fifty-four".