3125421121 has 2 divisors, whose sum is σ = 3125421122. Its totient is φ = 3125421120.

The previous prime is 3125421119. The next prime is 3125421157. The reversal of 3125421121 is 1211245213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2868780721 + 256640400 = 53561^2 + 16020^2 .

It is an emirp because it is prime and its reverse (1211245213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3125421121 - 2¹ = 3125421119 is a prime.

Together with 3125421119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 3125421092 and 3125421101.

It is not a weakly prime, because it can be changed into another prime (3125421161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1562710560 + 1562710561.

It is an arithmetic number, because the mean of its divisors is an integer number (1562710561).

Almost surely, 2^3125421121 is an apocalyptic number.

It is an amenable number.

3125421121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3125421121 is an equidigital number, since it uses as much as digits as its factorization.

3125421121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 22.

The square root of 3125421121 is about 55905.4659313381. The cubic root of 3125421121 is about 1462.0745389713.

Adding to 3125421121 its reverse (1211245213), we get a palindrome (4336666334).

The spelling of 3125421121 in words is "three billion, one hundred twenty-five million, four hundred twenty-one thousand, one hundred twenty-one".