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BaseRepresentation
bin101001000111…
…0001111101111
31111120001202012
41102032033233
521004213114
62045551435
7351131054
oct122161757
944501665
1021554159
1111191a60
12727557b
134608953
142c1102b
151d5b63e
hex148e3ef

21554159 has 8 divisors (see below), whose sum is σ = 23639040. Its totient is φ = 19490200.

The previous prime is 21554149. The next prime is 21554161. The reversal of 21554159 is 95145512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21554159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554149) 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, 3029 + ... + 7230.

It is an arithmetic number, because the mean of its divisors is an integer number (2954880).

Almost surely, 221554159 is an apocalyptic number.

21554159 is a deficient number, since it is larger than the sum of its proper divisors (2084881).

21554159 is a wasteful number, since it uses less digits than its factorization.

21554159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10461.

The product of its digits is 9000, while the sum is 32.

The square root of 21554159 is about 4642.6456896903. The cubic root of 21554159 is about 278.2981765229.

The spelling of 21554159 in words is "twenty-one million, five hundred fifty-four thousand, one hundred fifty-nine".

Divisors: 1 11 191 2101 10259 112849 1959469 21554159