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2122212021221 is a prime number
BaseRepresentation
bin11110111000011101101…
…100011001001111100101
321111212210121022210010102
4132320131230121033211
5234232242234134341
64302533012433445
7306216251354645
oct36703554311745
97455717283112
102122212021221
117490303a6216
122a3370618885
1312517bacb926
1474a038c2525
153a30c276c9b
hex1ee1db193e5

2122212021221 has 2 divisors, whose sum is σ = 2122212021222. Its totient is φ = 2122212021220.

The previous prime is 2122212021103. The next prime is 2122212021329. The reversal of 2122212021221 is 1221202122212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1943654222500 + 178557798721 = 1394150^2 + 422561^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122212021221 - 214 = 2122212004837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2122212021193 and 2122212021202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2122212021421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061106010610 + 1061106010611.

It is an arithmetic number, because the mean of its divisors is an integer number (1061106010611).

Almost surely, 22122212021221 is an apocalyptic number.

It is an amenable number.

2122212021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122212021221 is an equidigital number, since it uses as much as digits as its factorization.

2122212021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2122212021221 its reverse (1221202122212), we get a palindrome (3343414143433).

The spelling of 2122212021221 in words is "two trillion, one hundred twenty-two billion, two hundred twelve million, twenty-one thousand, two hundred twenty-one".