125421514221 has 16 divisors (see below), whose sum is σ = 168762888000. Its totient is φ = 82849987968.

The previous prime is 125421514219. The next prime is 125421514241. The reversal of 125421514221 is 122415124521.

It is not a de Polignac number, because 125421514221 - 2¹ = 125421514219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125421514241) 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 in 15 ways as a sum of consecutive naturals, for example, 160191 + ... + 525836.

It is an arithmetic number, because the mean of its divisors is an integer number (10547680500).

Almost surely, 2^125421514221 is an apocalyptic number.

It is an amenable number.

125421514221 is a deficient number, since it is larger than the sum of its proper divisors (43341373779).

125421514221 is a wasteful number, since it uses less digits than its factorization.

125421514221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686588.

The product of its digits is 6400, while the sum is 30.

Adding to 125421514221 its reverse (122415124521), we get a palindrome (247836638742).

The spelling of 125421514221 in words is "one hundred twenty-five billion, four hundred twenty-one million, five hundred fourteen thousand, two hundred twenty-one".