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BaseRepresentation
bin101001100000110
31002011012
411030012
51140004
6242222
7115652
oct51406
932135
1021254
1114a72
1210372
13989c
147a62
15646e
hex5306

21254 has 4 divisors (see below), whose sum is σ = 31884. Its totient is φ = 10626.

The previous prime is 21247. The next prime is 21269. The reversal of 21254 is 45212.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 21254.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5312 + ... + 5315.

It is an arithmetic number, because the mean of its divisors is an integer number (7971).

221254 is an apocalyptic number.

21254 is a deficient number, since it is larger than the sum of its proper divisors (10630).

21254 is a wasteful number, since it uses less digits than its factorization.

21254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10629.

The product of its digits is 80, while the sum is 14.

The square root of 21254 is about 145.7875166124. The cubic root of 21254 is about 27.7000291067.

Adding to 21254 its reverse (45212), we get a palindrome (66466).

The spelling of 21254 in words is "twenty-one thousand, two hundred fifty-four".

Divisors: 1 2 10627 21254