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21532210240 = 26567288157
BaseRepresentation
bin10100000011011010…
…110111010001000000
32001120121122121120011
4110003122313101000
5323044221211430
613520341554304
71361405524102
oct240332672100
961517577504
1021532210240
11914a40a282
12420b115994
132051c66c08
1410839b1572
1586052922a
hex5036b7440

21532210240 has 28 divisors (see below), whose sum is σ = 51273576396. Its totient is φ = 8612883968.

The previous prime is 21532210223. The next prime is 21532210241. The reversal of 21532210240 is 4201223512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9715650624 + 11816559616 = 98568^2 + 108704^2 .

It is not an unprimeable number, because it can be changed into a prime (21532210241) 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, 33643759 + ... + 33644398.

It is an arithmetic number, because the mean of its divisors is an integer number (1831199157).

Almost surely, 221532210240 is an apocalyptic number.

21532210240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21532210240 is an abundant number, since it is smaller than the sum of its proper divisors (29741366156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21532210240 is an equidigital number, since it uses as much as digits as its factorization.

21532210240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67288174 (or 67288164 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21532210240 its reverse (4201223512), we get a palindrome (25733433752).

The spelling of 21532210240 in words is "twenty-one billion, five hundred thirty-two million, two hundred ten thousand, two hundred forty".

Divisors: 1 2 4 5 8 10 16 20 32 40 64 80 160 320 67288157 134576314 269152628 336440785 538305256 672881570 1076610512 1345763140 2153221024 2691526280 4306442048 5383052560 10766105120 21532210240