121440244111 has 4 divisors (see below), whose sum is σ = 121484910400. Its totient is φ = 121395577824.

The previous prime is 121440244091. The next prime is 121440244129. The reversal of 121440244111 is 111442044121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111442044121 = 109519 ⋅1017559.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121440244111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121440284111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22329066 + ... + 22334503.

It is an arithmetic number, because the mean of its divisors is an integer number (30371227600).

Almost surely, 2^121440244111 is an apocalyptic number.

121440244111 is a deficient number, since it is larger than the sum of its proper divisors (44666289).

121440244111 is an equidigital number, since it uses as much as digits as its factorization.

121440244111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44666288.

The product of its (nonzero) digits is 1024, while the sum is 25.

Adding to 121440244111 its reverse (111442044121), we get a palindrome (232882288232).

The spelling of 121440244111 in words is "one hundred twenty-one billion, four hundred forty million, two hundred forty-four thousand, one hundred eleven".