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21231331011 = 331171485963
BaseRepresentation
bin10011110001011111…
…000110011011000011
32000210122111100212000
4103301133012123003
5321440210043021
613430433035043
71351063223142
oct236137063303
960718440760
1021231331011
119005595260
1241463b5a83
13200481bb77
141055a4d759
15843de4b26
hex4f17c66c3

21231331011 has 16 divisors (see below), whose sum is σ = 34313262720. Its totient is φ = 12867473160.

The previous prime is 21231330971. The next prime is 21231331021. The reversal of 21231331011 is 11013313212.

It is not a de Polignac number, because 21231331011 - 26 = 21231330947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21231331021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35742685 + ... + 35743278.

It is an arithmetic number, because the mean of its divisors is an integer number (2144578920).

Almost surely, 221231331011 is an apocalyptic number.

21231331011 is a deficient number, since it is larger than the sum of its proper divisors (13081931709).

21231331011 is a wasteful number, since it uses less digits than its factorization.

21231331011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71485983 (or 71485977 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21231331011 its reverse (11013313212), we get a palindrome (32244644223).

The spelling of 21231331011 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty-one thousand, eleven".

Divisors: 1 3 9 11 27 33 99 297 71485963 214457889 643373667 786345593 1930121001 2359036779 7077110337 21231331011