125211221 has 4 divisors (see below), whose sum is σ = 125979552. Its totient is φ = 124442892.

The previous prime is 125211217. The next prime is 125211257. The reversal of 125211221 is 122112521.

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 125211221 - 2² = 125211217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125211211) 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, 383921 + ... + 384246.

It is an arithmetic number, because the mean of its divisors is an integer number (31494888).

Almost surely, 2^125211221 is an apocalyptic number.

It is an amenable number.

125211221 is a deficient number, since it is larger than the sum of its proper divisors (768331).

125211221 is an equidigital number, since it uses as much as digits as its factorization.

125211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768330.

The product of its digits is 80, while the sum is 17.

The square root of 125211221 is about 11189.7819907271. The cubic root of 125211221 is about 500.2814695201.

Adding to 125211221 its reverse (122112521), we get a palindrome (247323742).

The spelling of 125211221 in words is "one hundred twenty-five million, two hundred eleven thousand, two hundred twenty-one".