121311 has 8 divisors (see below), whose sum is σ = 179760. Its totient is φ = 80856.
The previous prime is 121309. The next prime is 121313. The reversal of 121311 is 113121.
It is an interprime number because it is at equal distance from previous prime (121309) and next prime (121313).
It is not a de Polignac number, because 121311 - 21 = 121309 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a junction number, because it is equal to n+sod(n) for n = 121293 and 121302.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (121313) 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 7 ways as a sum of consecutive naturals, for example, 2220 + ... + 2273.
It is an arithmetic number, because the mean of its divisors is an integer number (22470).
2121311 is an apocalyptic number.
121311 is a deficient number, since it is larger than the sum of its proper divisors (58449).
121311 is an equidigital number, since it uses as much as digits as its factorization.
121311 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4502 (or 4496 counting only the distinct ones).
The product of its digits is 6, while the sum is 9.
The square root of 121311 is about 348.2972868111. The cubic root of 121311 is about 49.5032137491.
Adding to 121311 its reverse (113121), we get a palindrome (234432).
It can be divided in two parts, 1 and 21311, that added together give a palindrome (21312).
The spelling of 121311 in words is "one hundred twenty-one thousand, three hundred eleven", and thus it is an iban number.
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