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20021122217 is a prime number
BaseRepresentation
bin10010101001010110…
…100001010010101001
31220200022021101111002
4102221112201102221
5312000401402332
613110402044345
71306066505465
oct225126412251
956608241432
1020021122217
1185444464a8
123a690496b5
131b70b91aa5
14d7d0234a5
157c2a3e562
hex4a95a14a9

20021122217 has 2 divisors, whose sum is σ = 20021122218. Its totient is φ = 20021122216.

The previous prime is 20021122189. The next prime is 20021122223. The reversal of 20021122217 is 71222112002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15556076176 + 4465046041 = 124724^2 + 66821^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021122217 - 28 = 20021121961 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021122417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010561108 + 10010561109.

It is an arithmetic number, because the mean of its divisors is an integer number (10010561109).

Almost surely, 220021122217 is an apocalyptic number.

It is an amenable number.

20021122217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021122217 is an equidigital number, since it uses as much as digits as its factorization.

20021122217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 20021122217 its reverse (71222112002), we get a palindrome (91243234219).

The spelling of 20021122217 in words is "twenty billion, twenty-one million, one hundred twenty-two thousand, two hundred seventeen".