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BaseRepresentation
bin100100101010001000101
32021000202200
410211101011
5301414341
641425113
713132050
oct4452105
92230680
101201221
1175054a
1249b199
133309a8
14233a97
hex125445

1201221 has 24 divisors (see below), whose sum is σ = 2071680. Its totient is φ = 655776.

The previous prime is 1201217. The next prime is 1201229. The reversal of 1201221 is 1221021.

It is not a de Polignac number, because 1201221 - 22 = 1201217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1035 + ... + 1863.

It is an arithmetic number, because the mean of its divisors is an integer number (86320).

21201221 is an apocalyptic number.

It is an amenable number.

1201221 is a deficient number, since it is larger than the sum of its proper divisors (870459).

1201221 is a wasteful number, since it uses less digits than its factorization.

1201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865 (or 862 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1201221 is about 1096.0022810195. The cubic root of 1201221 is about 106.3018865374.

Adding to 1201221 its reverse (1221021), we get a palindrome (2422242).

It can be divided in two parts, 12012 and 21, that multiplied together give a palindrome (252252).

The spelling of 1201221 in words is "one million, two hundred one thousand, two hundred twenty-one".