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21154 = 271511
BaseRepresentation
bin101001010100010
31002000111
411022202
51134104
6241534
7115450
oct51242
932014
1021154
1114991
12102aa
139823
1479d0
156404
hex52a2

21154 has 8 divisors (see below), whose sum is σ = 36288. Its totient is φ = 9060.

The previous prime is 21149. The next prime is 21157. The reversal of 21154 is 45112.

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

It is not an unprimeable number, because it can be changed into a prime (21157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742 + ... + 769.

It is an arithmetic number, because the mean of its divisors is an integer number (4536).

221154 is an apocalyptic number.

21154 is a deficient number, since it is larger than the sum of its proper divisors (15134).

21154 is a wasteful number, since it uses less digits than its factorization.

21154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520.

The product of its digits is 40, while the sum is 13.

The square root of 21154 is about 145.4441473556. Note that the first 3 decimals coincide. The cubic root of 21154 is about 27.6565179467.

Adding to 21154 its reverse (45112), we get a palindrome (66266).

It can be divided in two parts, 2 and 1154, that added together give a square (1156 = 342).

The spelling of 21154 in words is "twenty-one thousand, one hundred fifty-four".

Divisors: 1 2 7 14 1511 3022 10577 21154