21854562 has 8 divisors (see below), whose sum is σ = 43709136. Its totient is φ = 7284852.

The previous prime is 21854561. The next prime is 21854563. The reversal of 21854562 is 26545812.

It is an interprime number because it is at equal distance from previous prime (21854561) and next prime (21854563).

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

21854562 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21854561) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1821208 + ... + 1821219.

It is an arithmetic number, because the mean of its divisors is an integer number (5463642).

Almost surely, 2^21854562 is an apocalyptic number.

21854562 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21854562 is a wasteful number, since it uses less digits than its factorization.

21854562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642432.

The product of its digits is 19200, while the sum is 33.

The square root of 21854562 is about 4674.8863087780. The cubic root of 21854562 is about 279.5851083245.

The spelling of 21854562 in words is "twenty-one million, eight hundred fifty-four thousand, five hundred sixty-two".