125444433421 has 2 divisors, whose sum is σ = 125444433422. Its totient is φ = 125444433420.

The previous prime is 125444433397. The next prime is 125444433431. The reversal of 125444433421 is 124334444521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121965085225 + 3479348196 = 349235^2 + 58986^2 .

It is a cyclic number.

It is not a de Polignac number, because 125444433421 - 2¹⁷ = 125444302349 is a prime.

It is a super-3 number, since 3×125444433421³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125444433431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62722216710 + 62722216711.

It is an arithmetic number, because the mean of its divisors is an integer number (62722216711).

Almost surely, 2^125444433421 is an apocalyptic number.

It is an amenable number.

125444433421 is a deficient number, since it is larger than the sum of its proper divisors (1).

125444433421 is an equidigital number, since it uses as much as digits as its factorization.

125444433421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 184320, while the sum is 37.

Adding to 125444433421 its reverse (124334444521), we get a palindrome (249778877942).

The spelling of 125444433421 in words is "one hundred twenty-five billion, four hundred forty-four million, four hundred thirty-three thousand, four hundred twenty-one".