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21020110020121 is a prime number
BaseRepresentation
bin1001100011110001000000…
…01100001101111000011001
32202102111120121102210121211
410301320200030031320121
510223343141131120441
6112412301044103121
74266436631102122
oct461704014157031
982374517383554
1021020110020121
116774640127773
122435a08394aa1
13b96259998764
14529543429049
15266babd4ba81
hex131e2030de19

21020110020121 has 2 divisors, whose sum is σ = 21020110020122. Its totient is φ = 21020110020120.

The previous prime is 21020110020101. The next prime is 21020110020157. The reversal of 21020110020121 is 12102001102012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18825089986521 + 2195020033600 = 4338789^2 + 1481560^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020110020121 - 215 = 21020109987353 is a prime.

It is not a weakly prime, because it can be changed into another prime (21020110020101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510055010060 + 10510055010061.

It is an arithmetic number, because the mean of its divisors is an integer number (10510055010061).

Almost surely, 221020110020121 is an apocalyptic number.

It is an amenable number.

21020110020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020110020121 is an equidigital number, since it uses as much as digits as its factorization.

21020110020121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21020110020121 its reverse (12102001102012), we get a palindrome (33122111122133).

The spelling of 21020110020121 in words is "twenty-one trillion, twenty billion, one hundred ten million, twenty thousand, one hundred twenty-one".