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11011221 = 341310457
BaseRepresentation
bin101010000000…
…010010010101
3202201102120000
4222000102111
510304324341
61032001513
7162410454
oct52002225
922642500
1011011221
116240991
123830299
132386c20
141668b9b
15e778b6
hexa80495

11011221 has 20 divisors (see below), whose sum is σ = 17715852. Its totient is φ = 6775488.

The previous prime is 11011211. The next prime is 11011243. The reversal of 11011221 is 12211011.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5948721 + 5062500 = 2439^2 + 2250^2 .

It is not a de Polignac number, because 11011221 - 26 = 11011157 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 (11011201) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4176 + ... + 6281.

Almost surely, 211011221 is an apocalyptic number.

It is an amenable number.

11011221 is a deficient number, since it is larger than the sum of its proper divisors (6704631).

11011221 is a wasteful number, since it uses less digits than its factorization.

11011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10482 (or 10473 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 11011221 is about 3318.3159885701. The cubic root of 11011221 is about 222.4736054201.

Adding to 11011221 its reverse (12211011), we get a palindrome (23222232).

The spelling of 11011221 in words is "eleven million, eleven thousand, two hundred twenty-one".

Divisors: 1 3 9 13 27 39 81 117 351 1053 10457 31371 94113 135941 282339 407823 847017 1223469 3670407 11011221