13125445120621 has 2 divisors, whose sum is σ = 13125445120622. Its totient is φ = 13125445120620.

The previous prime is 13125445120603. The next prime is 13125445120639. The reversal of 13125445120621 is 12602154452131.

It is a balanced prime because it is at equal distance from previous prime (13125445120603) and next prime (13125445120639).

It can be written as a sum of positive squares in only one way, i.e., 10217362924521 + 2908082196100 = 3196461^2 + 1705310^2 .

It is an emirp because it is prime and its reverse (12602154452131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13125445120621 - 2⁷ = 13125445120493 is a prime.

It is a super-2 number, since 2×13125445120621² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13125445130621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6562722560310 + 6562722560311.

It is an arithmetic number, because the mean of its divisors is an integer number (6562722560311).

Almost surely, 2^{13125445120621} is an apocalyptic number.

It is an amenable number.

13125445120621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13125445120621 is an equidigital number, since it uses as much as digits as its factorization.

13125445120621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 13125445120621 its reverse (12602154452131), we get a palindrome (25727599572752).

The spelling of 13125445120621 in words is "thirteen trillion, one hundred twenty-five billion, four hundred forty-five million, one hundred twenty thousand, six hundred twenty-one".