124140344021 has 4 divisors (see below), whose sum is σ = 127495488492. Its totient is φ = 120785199552.

The previous prime is 124140343997. The next prime is 124140344057. The reversal of 124140344021 is 120443041421.

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 107034319921 + 17106024100 = 327161^2 + 130790^2 .

It is a cyclic number.

It is not a de Polignac number, because 124140344021 - 2²² = 124136149717 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 (124140844021) 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, 1677572180 + ... + 1677572253.

It is an arithmetic number, because the mean of its divisors is an integer number (31873872123).

Almost surely, 2^124140344021 is an apocalyptic number.

It is an amenable number.

124140344021 is a deficient number, since it is larger than the sum of its proper divisors (3355144471).

124140344021 is an equidigital number, since it uses as much as digits as its factorization.

124140344021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355144470.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 124140344021 its reverse (120443041421), we get a palindrome (244583385442).

The spelling of 124140344021 in words is "one hundred twenty-four billion, one hundred forty million, three hundred forty-four thousand, twenty-one".