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1202221 is a prime number
BaseRepresentation
bin100100101100000101101
32021002010201
410211200231
5301432341
641433501
713135006
oct4454055
92232121
101202221
11751279
1249b891
13331297
142341ad
1518b331
hex12582d

1202221 has 2 divisors, whose sum is σ = 1202222. Its totient is φ = 1202220.

The previous prime is 1202219. The next prime is 1202231. The reversal of 1202221 is 1222021.

It is an a-pointer prime, because the next prime (1202231) can be obtained adding 1202221 to its sum of digits (10).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656100 + 546121 = 810^2 + 739^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202221 - 21 = 1202219 is a prime.

Together with 1202219, it forms a pair of twin primes.

1202221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1202198 and 1202207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1202231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601110 + 601111.

It is an arithmetic number, because the mean of its divisors is an integer number (601111).

21202221 is an apocalyptic number.

It is an amenable number.

1202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202221 is an equidigital number, since it uses as much as digits as its factorization.

1202221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1202221 is about 1096.4583895434. The cubic root of 1202221 is about 106.3313766429.

Adding to 1202221 its reverse (1222021), we get a palindrome (2424242).

The spelling of 1202221 in words is "one million, two hundred two thousand, two hundred twenty-one".