125415221 has 4 divisors (see below), whose sum is σ = 125610912. Its totient is φ = 125219532.

The previous prime is 125415217. The next prime is 125415247. The reversal of 125415221 is 122514521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 125415221 - 2² = 125415217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125415281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96881 + ... + 98166.

It is an arithmetic number, because the mean of its divisors is an integer number (31402728).

Almost surely, 2^125415221 is an apocalyptic number.

It is an amenable number.

125415221 is a deficient number, since it is larger than the sum of its proper divisors (195691).

125415221 is an equidigital number, since it uses as much as digits as its factorization.

125415221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195690.

The product of its digits is 800, while the sum is 23.

The square root of 125415221 is about 11198.8937400084. The cubic root of 125415221 is about 500.5530161208.

Adding to 125415221 its reverse (122514521), we get a palindrome (247929742).

The spelling of 125415221 in words is "one hundred twenty-five million, four hundred fifteen thousand, two hundred twenty-one".