12121761 has 8 divisors (see below), whose sum is σ = 16319680. Its totient is φ = 8002512.

The previous prime is 12121757. The next prime is 12121771. The reversal of 12121761 is 16712121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12121761 - 2² = 12121757 is a prime.

It is a super-2 number, since 2×12121761² = 293874179482242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12121721) 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, 19306 + ... + 19923.

It is an arithmetic number, because the mean of its divisors is an integer number (2039960).

Almost surely, 2^12121761 is an apocalyptic number.

It is an amenable number.

12121761 is a deficient number, since it is larger than the sum of its proper divisors (4197919).

12121761 is a wasteful number, since it uses less digits than its factorization.

12121761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39335.

The product of its digits is 168, while the sum is 21.

The square root of 12121761 is about 3481.6319449362. The cubic root of 12121761 is about 229.7145861065.

Adding to 12121761 its reverse (16712121), we get a palindrome (28833882).

It can be divided in two parts, 121217 and 61, that added together give a triangular number (121278 = T₄₉₂).

The spelling of 12121761 in words is "twelve million, one hundred twenty-one thousand, seven hundred sixty-one".