125012535221 has 6 divisors (see below), whose sum is σ = 145422745110. Its totient is φ = 107153601576.

The previous prime is 125012535169. The next prime is 125012535229. The reversal of 125012535221 is 122535210521.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 125011744900 + 790321 = 353570^2 + 889^2 .

It is not a de Polignac number, because 125012535221 - 2²⁶ = 124945426357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125012535229) 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 5 ways as a sum of consecutive naturals, for example, 1275638066 + ... + 1275638163.

It is an arithmetic number, because the mean of its divisors is an integer number (24237124185).

Almost surely, 2^125012535221 is an apocalyptic number.

It is an amenable number.

125012535221 is a deficient number, since it is larger than the sum of its proper divisors (20410209889).

125012535221 is an equidigital number, since it uses as much as digits as its factorization.

125012535221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551276243 (or 2551276236 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 125012535221 its reverse (122535210521), we get a palindrome (247547745742).

The spelling of 125012535221 in words is "one hundred twenty-five billion, twelve million, five hundred thirty-five thousand, two hundred twenty-one".