125135005221 has 8 divisors (see below), whose sum is σ = 185385192960. Its totient is φ = 83423336796.

The previous prime is 125135005211. The next prime is 125135005291. The reversal of 125135005221 is 122500531521.

125135005221 is a `hidden beast` number, since 1 + 2 + 5 + 135 + 0 + 0 + 522 + 1 = 666.

It is not a de Polignac number, because 125135005221 - 2¹¹ = 125135003173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4634629823 = 125135005221 / (1 + 2 + 5 + 1 + 3 + 5 + 0 + 0 + 5 + 2 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125135005211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2317314885 + ... + 2317314938.

It is an arithmetic number, because the mean of its divisors is an integer number (23173149120).

Almost surely, 2^125135005221 is an apocalyptic number.

It is an amenable number.

125135005221 is a deficient number, since it is larger than the sum of its proper divisors (60250187739).

125135005221 is an equidigital number, since it uses as much as digits as its factorization.

125135005221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4634629832 (or 4634629826 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 125135005221 its reverse (122500531521), we get a palindrome (247635536742).

The spelling of 125135005221 in words is "one hundred twenty-five billion, one hundred thirty-five million, five thousand, two hundred twenty-one".