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21329423 = 83256981
BaseRepresentation
bin101000101011…
…1011000001111
31111010122110122
41101113120033
520430020143
62041055155
7346203623
oct121273017
944118418
1021329423
1111049125
1271874bb
13455a57b
142b93183
151d14c68
hex145760f

21329423 has 4 divisors (see below), whose sum is σ = 21586488. Its totient is φ = 21072360.

The previous prime is 21329401. The next prime is 21329431. The reversal of 21329423 is 32492312.

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

It is a cyclic number.

It is not a de Polignac number, because 21329423 - 28 = 21329167 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21329392 and 21329401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21329923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128408 + ... + 128573.

It is an arithmetic number, because the mean of its divisors is an integer number (5396622).

Almost surely, 221329423 is an apocalyptic number.

21329423 is a deficient number, since it is larger than the sum of its proper divisors (257065).

21329423 is an equidigital number, since it uses as much as digits as its factorization.

21329423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257064.

The product of its digits is 2592, while the sum is 26.

The square root of 21329423 is about 4618.3788281171. The cubic root of 21329423 is about 277.3275632442.

The spelling of 21329423 in words is "twenty-one million, three hundred twenty-nine thousand, four hundred twenty-three".

Divisors: 1 83 256981 21329423