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12211121 = 13939317
BaseRepresentation
bin101110100101…
…001110110001
3211222101111202
4232211032301
511111223441
61113420545
7205535636
oct56451661
924871452
1012211121
11699043a
12410a755
1326b7120
14189c18d
15111319b
hexba53b1

12211121 has 4 divisors (see below), whose sum is σ = 13150452. Its totient is φ = 11271792.

The previous prime is 12211103. The next prime is 12211123. The reversal of 12211121 is 12111221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3591025 + 8620096 = 1895^2 + 2936^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211121 - 26 = 12211057 is a prime.

It is a super-2 number, since 2×122111212 = 298222952153282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12211123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469646 + ... + 469671.

It is an arithmetic number, because the mean of its divisors is an integer number (3287613).

Almost surely, 212211121 is an apocalyptic number.

It is an amenable number.

12211121 is a deficient number, since it is larger than the sum of its proper divisors (939331).

12211121 is an equidigital number, since it uses as much as digits as its factorization.

12211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939330.

The product of its digits is 8, while the sum is 11.

The square root of 12211121 is about 3494.4414432066. The cubic root of 12211121 is about 230.2776797443.

Adding to 12211121 its reverse (12111221), we get a palindrome (24322342).

It can be divided in two parts, 1 and 2211121, that added together give a palindrome (2211122).

The spelling of 12211121 in words is "twelve million, two hundred eleven thousand, one hundred twenty-one".

Divisors: 1 13 939317 12211121