124402660021 has 4 divisors (see below), whose sum is σ = 124404473452. Its totient is φ = 124400846592.

The previous prime is 124402660003. The next prime is 124402660043. The reversal of 124402660021 is 120066204421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120066204421 = 8861 ⋅13549961.

It can be written as a sum of positive squares in 2 ways, for example, as 68793945796 + 55608714225 = 262286^2 + 235815^2 .

It is a cyclic number.

It is not a de Polignac number, because 124402660021 - 2⁷ = 124402659893 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 (124402660001) 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, 799596 + ... + 942421.

It is an arithmetic number, because the mean of its divisors is an integer number (31101118363).

Almost surely, 2^124402660021 is an apocalyptic number.

It is an amenable number.

124402660021 is a deficient number, since it is larger than the sum of its proper divisors (1813431).

124402660021 is an equidigital number, since it uses as much as digits as its factorization.

124402660021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813430.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 124402660021 its reverse (120066204421), we get a palindrome (244468864442).

The spelling of 124402660021 in words is "one hundred twenty-four billion, four hundred two million, six hundred sixty thousand, twenty-one".