124401031421 has 2 divisors, whose sum is σ = 124401031422. Its totient is φ = 124401031420.

The previous prime is 124401031387. The next prime is 124401031423. The reversal of 124401031421 is 124130104421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75961423321 + 48439608100 = 275611^2 + 220090^2 .

It is an emirp because it is prime and its reverse (124130104421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124401031421 is a prime.

It is a Sophie Germain prime.

Together with 124401031423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124401031423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62200515710 + 62200515711.

It is an arithmetic number, because the mean of its divisors is an integer number (62200515711).

Almost surely, 2^124401031421 is an apocalyptic number.

It is an amenable number.

124401031421 is a deficient number, since it is larger than the sum of its proper divisors (1).

124401031421 is an equidigital number, since it uses as much as digits as its factorization.

124401031421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 124401031421 its reverse (124130104421), we get a palindrome (248531135842).

The spelling of 124401031421 in words is "one hundred twenty-four billion, four hundred one million, thirty-one thousand, four hundred twenty-one".