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21227064968 = 23515112
BaseRepresentation
bin10011110001001110…
…110100111010001000
32000210100110121221102
4103301032310322020
5321433112034333
613430201400532
71351012034534
oct236116647210
960710417842
1021227064968
1190031410aa
124144a99148
132003987195
14105525cbc4
15843850ae8
hex4f13b4e88

21227064968 has 12 divisors (see below), whose sum is σ = 39801519495. Its totient is φ = 10613326440.

The previous prime is 21227064959. The next prime is 21227064997. The reversal of 21227064968 is 86946072212.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 10613532484 + 10613532484 = 103022^2 + 103022^2 .

It is an ABA number since it can be written as A⋅BA, here for A=2, B=103022.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 386333 + ... + 437843.

Almost surely, 221227064968 is an apocalyptic number.

It is an amenable number.

21227064968 is a deficient number, since it is larger than the sum of its proper divisors (18574454527).

21227064968 is an frugal number, since it uses more digits than its factorization.

21227064968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103028 (or 51513 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 21227064968 in words is "twenty-one billion, two hundred twenty-seven million, sixty-four thousand, nine hundred sixty-eight".

Divisors: 1 2 4 8 51511 103022 206044 412088 2653383121 5306766242 10613532484 21227064968