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21433403231 = 23931887097
BaseRepresentation
bin10011111101100001…
…111100011101011111
32001022201201200211022
4103331201330131133
5322343422400411
613502452114355
71356065631032
oct237541743537
961281650738
1021433403231
1190a9663099
1241a20059bb
132037650426
141074811019
15856a0cedb
hex4fd87c75f

21433403231 has 4 divisors (see below), whose sum is σ = 22365290352. Its totient is φ = 20501516112.

The previous prime is 21433403221. The next prime is 21433403237. The reversal of 21433403231 is 13230433412.

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 21433403231 - 218 = 21433141087 is a prime.

It is a super-2 number, since 2×214334032312 (a number of 21 digits) contains 22 as substring.

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 21433403231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433403237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465943526 + ... + 465943571.

It is an arithmetic number, because the mean of its divisors is an integer number (5591322588).

Almost surely, 221433403231 is an apocalyptic number.

21433403231 is a deficient number, since it is larger than the sum of its proper divisors (931887121).

21433403231 is an equidigital number, since it uses as much as digits as its factorization.

21433403231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931887120.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21433403231 its reverse (13230433412), we get a palindrome (34663836643).

The spelling of 21433403231 in words is "twenty-one billion, four hundred thirty-three million, four hundred three thousand, two hundred thirty-one".

Divisors: 1 23 931887097 21433403231