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21032309789 is a prime number
BaseRepresentation
bin10011100101100111…
…111001010000011101
32000021210000001001122
4103211213321100131
5321033232403124
613355003220325
71343125453301
oct234547712035
960253001048
1021032309789
118a13210707
1240ab8176a5
131ca251822a
141037443d01
158316d075e
hex4e59f941d

21032309789 has 2 divisors, whose sum is σ = 21032309790. Its totient is φ = 21032309788.

The previous prime is 21032309777. The next prime is 21032309797. The reversal of 21032309789 is 98790323012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14036325625 + 6995984164 = 118475^2 + 83642^2 .

It is a cyclic number.

It is not a de Polignac number, because 21032309789 - 28 = 21032309533 is a prime.

It is a super-3 number, since 3×210323097893 (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21032308789) 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, 10516154894 + 10516154895.

It is an arithmetic number, because the mean of its divisors is an integer number (10516154895).

Almost surely, 221032309789 is an apocalyptic number.

It is an amenable number.

21032309789 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032309789 is an equidigital number, since it uses as much as digits as its factorization.

21032309789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 21032309789 in words is "twenty-one billion, thirty-two million, three hundred nine thousand, seven hundred eighty-nine".