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21000121000010 = 255581376278821
BaseRepresentation
bin1001100011001011110001…
…10000001010000001001010
32202100120222112120100221122
410301211320300022001022
510223031221434000020
6112355153350035242
74265131401165425
oct461457060120112
982316875510848
1021000121000010
116767112918039
122431b6a048b22
13b943c26666c9
145285a87a09bc
152663dc04e125
hex131978c0a04a

21000121000010 has 16 divisors (see below), whose sum is σ = 37806990919272. Its totient is φ = 8398543262400.

The previous prime is 21000120999973. The next prime is 21000121000031. The reversal of 21000121000010 is 1000012100012.

It can be written as a sum of positive squares in 4 ways, for example, as 13447336377721 + 7552784622289 = 3667061^2 + 2748233^2 .

It is a super-2 number, since 2×210001210000102 (a number of 27 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 188083601 + ... + 188195220.

Almost surely, 221000121000010 is an apocalyptic number.

21000121000010 is a deficient number, since it is larger than the sum of its proper divisors (16806869919262).

21000121000010 is a wasteful number, since it uses less digits than its factorization.

21000121000010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376284409.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21000121000010 its reverse (1000012100012), we get a palindrome (22000133100022).

The spelling of 21000121000010 in words is "twenty-one trillion, one hundred twenty-one million, ten", and thus it is an aban number.

Divisors: 1 2 5 10 5581 11162 27905 55810 376278821 752557642 1881394105 3762788210 2100012100001 4200024200002 10500060500005 21000121000010