13121124421 has 2 divisors, whose sum is σ = 13121124422. Its totient is φ = 13121124420.

The previous prime is 13121124403. The next prime is 13121124427. The reversal of 13121124421 is 12442112131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8665561921 + 4455562500 = 93089^2 + 66750^2 .

It is a cyclic number.

It is not a de Polignac number, because 13121124421 - 2⁹ = 13121123909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13121124392 and 13121124401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13121124427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6560562210 + 6560562211.

It is an arithmetic number, because the mean of its divisors is an integer number (6560562211).

Almost surely, 2^13121124421 is an apocalyptic number.

It is an amenable number.

13121124421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13121124421 is an equidigital number, since it uses as much as digits as its factorization.

13121124421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 22.

Adding to 13121124421 its reverse (12442112131), we get a palindrome (25563236552).

The spelling of 13121124421 in words is "thirteen billion, one hundred twenty-one million, one hundred twenty-four thousand, four hundred twenty-one".