121121727 has 4 divisors (see below), whose sum is σ = 161495640. Its totient is φ = 80747816.

The previous prime is 121121723. The next prime is 121121797. The reversal of 121121727 is 727121121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 727121121 = 3 ⋅242373707.

It is a cyclic number.

It is not a de Polignac number, because 121121727 - 2² = 121121723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121121697 and 121121706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20186952 + ... + 20186957.

It is an arithmetic number, because the mean of its divisors is an integer number (40373910).

Almost surely, 2^121121727 is an apocalyptic number.

121121727 is a deficient number, since it is larger than the sum of its proper divisors (40373913).

121121727 is an equidigital number, since it uses as much as digits as its factorization.

121121727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40373912.

The product of its digits is 392, while the sum is 24.

The square root of 121121727 is about 11005.5316545817. The cubic root of 121121727 is about 494.7745488985.

Adding to 121121727 its reverse (727121121), we get a palindrome (848242848).

The spelling of 121121727 in words is "one hundred twenty-one million, one hundred twenty-one thousand, seven hundred twenty-seven".