Search a number
-
+
21141253 = 79293251
BaseRepresentation
bin101000010100…
…1011100000101
31110210002100101
41100221130011
520403010003
62033044101
7344461210
oct120513405
943702311
1021141253
1110a2a811
1270b6631
1344c2a23
142b44777
151cc911d
hex1429705

21141253 has 8 divisors (see below), whose sum is σ = 24194880. Its totient is φ = 18096000.

The previous prime is 21141233. The next prime is 21141257. The reversal of 21141253 is 35214112.

21141253 is a nontrivial binomial coefficient, being equal to C(6503, 2).

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-21141253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21141253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21141257) 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, 4878 + ... + 8128.

It is an arithmetic number, because the mean of its divisors is an integer number (3024360).

Almost surely, 221141253 is an apocalyptic number.

21141253 is the 6502-nd triangular number.

21141253 is the 2168-th centered nonagonal number.

It is an amenable number.

21141253 is a deficient number, since it is larger than the sum of its proper divisors (3053627).

21141253 is an equidigital number, since it uses as much as digits as its factorization.

21141253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4187.

The product of its digits is 240, while the sum is 19.

The square root of 21141253 is about 4597.9618310725. The cubic root of 21141253 is about 276.5096173244.

Adding to 21141253 its reverse (35214112), we get a palindrome (56355365).

The spelling of 21141253 in words is "twenty-one million, one hundred forty-one thousand, two hundred fifty-three".

Divisors: 1 7 929 3251 6503 22757 3020179 21141253