Base | Representation |
---|---|
bin | 10011100011101100… |
… | …101110000000101011 |
3 | 2000012112020112210221 |
4 | 103203230232000223 |
5 | 321002001120021 |
6 | 13351451150511 |
7 | 1342254140065 |
oct | 234354560053 |
9 | 60175215727 |
10 | 21000020011 |
11 | 89a6a66943 |
12 | 40a0a45437 |
13 | 1c98920c59 |
14 | 103303a735 |
15 | 82d953241 |
hex | 4e3b2e02b |
21000020011 has 4 divisors (see below), whose sum is σ = 21287691592. Its totient is φ = 20712348432.
The previous prime is 21000019991. The next prime is 21000020053. The reversal of 21000020011 is 11002000012.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-21000020011 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 21000019976 and 21000020003.
It is not an unprimeable number, because it can be changed into a prime (21000020711) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143835681 + ... + 143835826.
It is an arithmetic number, because the mean of its divisors is an integer number (5321922898).
Almost surely, 221000020011 is an apocalyptic number.
21000020011 is a deficient number, since it is larger than the sum of its proper divisors (287671581).
21000020011 is an equidigital number, since it uses as much as digits as its factorization.
21000020011 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 287671580.
The product of its (nonzero) digits is 4, while the sum is 7.
Adding to 21000020011 its reverse (11002000012), we get a palindrome (32002020023).
The spelling of 21000020011 in words is "twenty-one billion, twenty thousand, eleven".
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