124440420111121 has 4 divisors (see below), whose sum is σ = 128731469080500. Its totient is φ = 120149371141744.

The previous prime is 124440420111043. The next prime is 124440420111211. The reversal of 124440420111121 is 121111024044421.

It is a happy number.

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 104707412536896 + 19733007574225 = 10232664^2 + 4442185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124440420111121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 124440420111121.

It is not an unprimeable number, because it can be changed into a prime (124440420171121) 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, 2145524484646 + ... + 2145524484703.

It is an arithmetic number, because the mean of its divisors is an integer number (32182867270125).

Almost surely, 2^{124440420111121} is an apocalyptic number.

It is an amenable number.

124440420111121 is a deficient number, since it is larger than the sum of its proper divisors (4291048969379).

124440420111121 is an equidigital number, since it uses as much as digits as its factorization.

124440420111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4291048969378.

The product of its (nonzero) digits is 2048, while the sum is 28.

Adding to 124440420111121 its reverse (121111024044421), we get a palindrome (245551444155542).

The spelling of 124440420111121 in words is "one hundred twenty-four trillion, four hundred forty billion, four hundred twenty million, one hundred eleven thousand, one hundred twenty-one".