124242140221 has 2 divisors, whose sum is σ = 124242140222. Its totient is φ = 124242140220.

The previous prime is 124242140219. The next prime is 124242140261. The reversal of 124242140221 is 122041242421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115505499321 + 8736640900 = 339861^2 + 93470^2 .

It is a cyclic number.

It is not a de Polignac number, because 124242140221 - 2¹ = 124242140219 is a prime.

It is a super-2 number, since 2×124242140221² (a number of 23 digits) contains 22 as substring.

Together with 124242140219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124242140261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62121070110 + 62121070111.

It is an arithmetic number, because the mean of its divisors is an integer number (62121070111).

Almost surely, 2^124242140221 is an apocalyptic number.

It is an amenable number.

124242140221 is a deficient number, since it is larger than the sum of its proper divisors (1).

124242140221 is an equidigital number, since it uses as much as digits as its factorization.

124242140221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 124242140221 its reverse (122041242421), we get a palindrome (246283382642).

The spelling of 124242140221 in words is "one hundred twenty-four billion, two hundred forty-two million, one hundred forty thousand, two hundred twenty-one".