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21040032305 = 57095935129
BaseRepresentation
bin10011100110000101…
…010110101000110001
32000022022112101100202
4103212011112220301
5321042222013210
613355440524545
71343251216025
oct234605265061
960268471322
1021040032305
118a17605756
1240b2320755
131ca3cc0276
141038494385
158322089a5
hex4e6156a31

21040032305 has 8 divisors (see below), whose sum is σ = 25283653800. Its totient is φ = 16808282496.

The previous prime is 21040032287. The next prime is 21040032313. The reversal of 21040032305 is 50323004012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1238195344 + 19801836961 = 35188^2 + 140719^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21040032305 - 222 = 21035838001 is a prime.

It is a super-2 number, since 2×210400323052 (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2964020 + ... + 2971109.

It is an arithmetic number, because the mean of its divisors is an integer number (3160456725).

Almost surely, 221040032305 is an apocalyptic number.

It is an amenable number.

21040032305 is a deficient number, since it is larger than the sum of its proper divisors (4243621495).

21040032305 is an equidigital number, since it uses as much as digits as its factorization.

21040032305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5935843.

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 21040032305 its reverse (50323004012), we get a palindrome (71363036317).

The spelling of 21040032305 in words is "twenty-one billion, forty million, thirty-two thousand, three hundred five".

Divisors: 1 5 709 3545 5935129 29675645 4208006461 21040032305