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21885018944 = 26973525293
BaseRepresentation
bin10100011000011100…
…101110001101000000
32002111012112011010012
4110120130232031000
5324310031101234
614015343524052
71403221406645
oct243034561500
962435464105
1021885018944
119310582718
1242a92b9628
1320aa094669
1410b87addcc
158814ba0ce
hex51872e340

21885018944 has 28 divisors (see below), whose sum is σ = 43875809124. Its totient is φ = 10829697024.

The previous prime is 21885018937. The next prime is 21885018971. The reversal of 21885018944 is 44981058812.

It can be written as a sum of positive squares in 2 ways, for example, as 11092302400 + 10792716544 = 105320^2 + 103888^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21885018892 and 21885018901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1756439 + ... + 1768854.

It is an arithmetic number, because the mean of its divisors is an integer number (1566993183).

Almost surely, 221885018944 is an apocalyptic number.

It is an amenable number.

21885018944 is an abundant number, since it is smaller than the sum of its proper divisors (21990790180).

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

21885018944 is an equidigital number, since it uses as much as digits as its factorization.

21885018944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3525402 (or 3525392 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 50.

The spelling of 21885018944 in words is "twenty-one billion, eight hundred eighty-five million, eighteen thousand, nine hundred forty-four".

Divisors: 1 2 4 8 16 32 64 97 194 388 776 1552 3104 6208 3525293 7050586 14101172 28202344 56404688 112809376 225618752 341953421 683906842 1367813684 2735627368 5471254736 10942509472 21885018944