124200021245 has 4 divisors (see below), whose sum is σ = 149040025500. Its totient is φ = 99360016992.

The previous prime is 124200021233. The next prime is 124200021259. The reversal of 124200021245 is 542120002421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542120002421 = 211 ⋅2569289111.

It can be written as a sum of positive squares in 2 ways, for example, as 16144497721 + 108055523524 = 127061^2 + 328718^2 .

It is a cyclic number.

It is not a de Polignac number, because 124200021245 - 2¹⁴ = 124200004861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 124200021245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12420002120 + ... + 12420002129.

It is an arithmetic number, because the mean of its divisors is an integer number (37260006375).

Almost surely, 2^124200021245 is an apocalyptic number.

It is an amenable number.

124200021245 is a deficient number, since it is larger than the sum of its proper divisors (24840004255).

124200021245 is an equidigital number, since it uses as much as digits as its factorization.

124200021245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24840004254.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 124200021245 its reverse (542120002421), we get a palindrome (666320023666).

The spelling of 124200021245 in words is "one hundred twenty-four billion, two hundred million, twenty-one thousand, two hundred forty-five".