21854289 has 8 divisors (see below), whose sum is σ = 29302560. Its totient is φ = 14487776.

The previous prime is 21854269. The next prime is 21854293. The reversal of 21854289 is 98245812.

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

It is a cyclic number.

It is not a de Polignac number, because 21854289 - 2¹² = 21850193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21854219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19812 + ... + 20885.

It is an arithmetic number, because the mean of its divisors is an integer number (3662820).

Almost surely, 2^21854289 is an apocalyptic number.

It is an amenable number.

21854289 is a deficient number, since it is larger than the sum of its proper divisors (7448271).

21854289 is a wasteful number, since it uses less digits than its factorization.

21854289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40879.

The product of its digits is 46080, while the sum is 39.

The square root of 21854289 is about 4674.8571101158. The cubic root of 21854289 is about 279.5839441580.

The spelling of 21854289 in words is "twenty-one million, eight hundred fifty-four thousand, two hundred eighty-nine".