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20011020221 is a prime number
BaseRepresentation
bin10010101000101111…
…111110111110111101
31220122121021011011002
4102220233332332331
5311440310121341
613105401340045
71305614602553
oct225057767675
956577234132
1020011020221
118539776745
123a65797625
131b6ba6598a
14d7b953bd3
157c1be629b
hex4a8bfefbd

20011020221 has 2 divisors, whose sum is σ = 20011020222. Its totient is φ = 20011020220.

The previous prime is 20011020199. The next prime is 20011020223. The reversal of 20011020221 is 12202011002.

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., 18390072100 + 1620948121 = 135610^2 + 40261^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011020221 - 26 = 20011020157 is a prime.

Together with 20011020223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011020223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005510110 + 10005510111.

It is an arithmetic number, because the mean of its divisors is an integer number (10005510111).

Almost surely, 220011020221 is an apocalyptic number.

It is an amenable number.

20011020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011020221 is an equidigital number, since it uses as much as digits as its factorization.

20011020221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20011020221 its reverse (12202011002), we get a palindrome (32213031223).

The spelling of 20011020221 in words is "twenty billion, eleven million, twenty thousand, two hundred twenty-one".