21654059 has 8 divisors (see below), whose sum is σ = 24776160. Its totient is φ = 18539136.

The previous prime is 21654041. The next prime is 21654067. The reversal of 21654059 is 95045612.

It is a happy number.

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

It is not a de Polignac number, because 21654059 - 2¹² = 21649963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21654019) 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, 9107 + ... + 11235.

It is an arithmetic number, because the mean of its divisors is an integer number (3097020).

Almost surely, 2^21654059 is an apocalyptic number.

21654059 is a deficient number, since it is larger than the sum of its proper divisors (3122101).

21654059 is a wasteful number, since it uses less digits than its factorization.

21654059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3589.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 21654059 is about 4653.3922035436. The cubic root of 21654059 is about 278.7274694734.

The spelling of 21654059 in words is "twenty-one million, six hundred fifty-four thousand, fifty-nine".