124320124421221 has 2 divisors, whose sum is σ = 124320124421222. Its totient is φ = 124320124421220.

The previous prime is 124320124421209. The next prime is 124320124421243. The reversal of 124320124421221 is 122124421023421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120121293120196 + 4198831301025 = 10959986^2 + 2049105^2 .

It is a cyclic number.

It is not a de Polignac number, because 124320124421221 - 2¹¹ = 124320124419173 is a prime.

It is a super-2 number, since 2×124320124421221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124320124421261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62160062210610 + 62160062210611.

It is an arithmetic number, because the mean of its divisors is an integer number (62160062210611).

Almost surely, 2^{124320124421221} is an apocalyptic number.

It is an amenable number.

124320124421221 is a deficient number, since it is larger than the sum of its proper divisors (1).

124320124421221 is an equidigital number, since it uses as much as digits as its factorization.

124320124421221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 31.

Adding to 124320124421221 its reverse (122124421023421), we get a palindrome (246444545444642).

The spelling of 124320124421221 in words is "one hundred twenty-four trillion, three hundred twenty billion, one hundred twenty-four million, four hundred twenty-one thousand, two hundred twenty-one".