125503514221 has 2 divisors, whose sum is σ = 125503514222. Its totient is φ = 125503514220.

The previous prime is 125503514219. The next prime is 125503514273. The reversal of 125503514221 is 122415305521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125057713225 + 445800996 = 353635^2 + 21114^2 .

It is a cyclic number.

It is not a de Polignac number, because 125503514221 - 2¹ = 125503514219 is a prime.

It is a super-2 number, since 2×125503514221² (a number of 23 digits) contains 22 as substring.

Together with 125503514219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125503514821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62751757110 + 62751757111.

It is an arithmetic number, because the mean of its divisors is an integer number (62751757111).

Almost surely, 2^125503514221 is an apocalyptic number.

It is an amenable number.

125503514221 is a deficient number, since it is larger than the sum of its proper divisors (1).

125503514221 is an equidigital number, since it uses as much as digits as its factorization.

125503514221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 125503514221 its reverse (122415305521), we get a palindrome (247918819742).

The spelling of 125503514221 in words is "one hundred twenty-five billion, five hundred three million, five hundred fourteen thousand, two hundred twenty-one".