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21429 = 322381
BaseRepresentation
bin101001110110101
31002101200
411032311
51141204
6243113
7116322
oct51665
932350
1021429
1115111
1210499
1399a5
147b49
156539
hex53b5

21429 has 6 divisors (see below), whose sum is σ = 30966. Its totient is φ = 14280.

The previous prime is 21419. The next prime is 21433. The reversal of 21429 is 92412.

It can be written as a sum of positive squares in only one way, i.e., 11025 + 10404 = 105^2 + 102^2 .

It is not a de Polignac number, because 21429 - 25 = 21397 is a prime.

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 21429.

It is not an unprimeable number, because it can be changed into a prime (21419) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1182 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (5161).

221429 is an apocalyptic number.

It is an amenable number.

21429 is a deficient number, since it is larger than the sum of its proper divisors (9537).

21429 is a wasteful number, since it uses less digits than its factorization.

21429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387 (or 2384 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 21429 is about 146.3864747851. The cubic root of 21429 is about 27.7758463842.

It can be divided in two parts, 214 and 29, that added together give a 5-th power (243 = 35).

The spelling of 21429 in words is "twenty-one thousand, four hundred twenty-nine".

Divisors: 1 3 9 2381 7143 21429