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21232055231 = 128316548757
BaseRepresentation
bin10011110001100001…
…110111001110111111
32000210200212011021222
4103301201313032333
5321440401231411
613430500343555
71351102330442
oct236141671677
960720764258
1021232055231
119005a3a392
1241466a4bbb
132004a136ba
141055b9b659
15843ed94db
hex4f18773bf

21232055231 has 4 divisors (see below), whose sum is σ = 21248605272. Its totient is φ = 21215505192.

The previous prime is 21232055203. The next prime is 21232055233. The reversal of 21232055231 is 13255023212.

It is a happy number.

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 21232055231 - 214 = 21232038847 is a prime.

It is a super-2 number, since 2×212320552312 (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 21232055231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232055233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8273096 + ... + 8275661.

It is an arithmetic number, because the mean of its divisors is an integer number (5312151318).

Almost surely, 221232055231 is an apocalyptic number.

21232055231 is a deficient number, since it is larger than the sum of its proper divisors (16550041).

21232055231 is a wasteful number, since it uses less digits than its factorization.

21232055231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16550040.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21232055231 its reverse (13255023212), we get a palindrome (34487078443).

The spelling of 21232055231 in words is "twenty-one billion, two hundred thirty-two million, fifty-five thousand, two hundred thirty-one".

Divisors: 1 1283 16548757 21232055231