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BaseRepresentation
bin10010101001010110…
…011100011001110101
31220200022020101000121
4102221112130121311
5312000400232242
613110401411541
71306066363225
oct225126343165
956608211017
1020021102197
118544432458
123a69039bb1
131b70b85945
14d7d01a085
157c2a38667
hex4a959c675

20021102197 has 2 divisors, whose sum is σ = 20021102198. Its totient is φ = 20021102196.

The previous prime is 20021102183. The next prime is 20021102203. The reversal of 20021102197 is 79120112002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19971625041 + 49477156 = 141321^2 + 7034^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021102197 - 211 = 20021100149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021102107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010551098 + 10010551099.

It is an arithmetic number, because the mean of its divisors is an integer number (10010551099).

Almost surely, 220021102197 is an apocalyptic number.

It is an amenable number.

20021102197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021102197 is an equidigital number, since it uses as much as digits as its factorization.

20021102197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 25.

Adding to 20021102197 its reverse (79120112002), we get a palindrome (99141214199).

The spelling of 20021102197 in words is "twenty billion, twenty-one million, one hundred two thousand, one hundred ninety-seven".