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21512311303 = 73722244841
BaseRepresentation
bin10100000010001110…
…111101001000000111
32001112020012122100111
4110002032331020013
5323024122430203
613514351253451
71361044425520
oct240216751007
961466178314
1021512311303
11913a15897a
12420451a287
13204aaba7b2
1410810b1847
1585d8e826d
hex5023bd207

21512311303 has 12 divisors (see below), whose sum is σ = 25267941552. Its totient is φ = 17940761280.

The previous prime is 21512311237. The next prime is 21512311319. The reversal of 21512311303 is 30311321512.

It is not a de Polignac number, because 21512311303 - 217 = 21512180231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21512311363) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1112838 + ... + 1132003.

It is an arithmetic number, because the mean of its divisors is an integer number (2105661796).

Almost surely, 221512311303 is an apocalyptic number.

21512311303 is a deficient number, since it is larger than the sum of its proper divisors (3755630249).

21512311303 is an equidigital number, since it uses as much as digits as its factorization.

21512311303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244922 (or 2244885 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 21512311303 its reverse (30311321512), we get a palindrome (51823632815).

The spelling of 21512311303 in words is "twenty-one billion, five hundred twelve million, three hundred eleven thousand, three hundred three".

Divisors: 1 7 37 259 1369 9583 2244841 15713887 83059117 581413819 3073187329 21512311303