12525273221 has 4 divisors (see below), whose sum is σ = 12602115552. Its totient is φ = 12448430892.

The previous prime is 12525273203. The next prime is 12525273227. The reversal of 12525273221 is 12237252521.

It is a happy number.

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 12525273221 - 2¹⁴ = 12525256837 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 (12525273227) 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, 38420921 + ... + 38421246.

It is an arithmetic number, because the mean of its divisors is an integer number (3150528888).

Almost surely, 2^12525273221 is an apocalyptic number.

It is an amenable number.

12525273221 is a deficient number, since it is larger than the sum of its proper divisors (76842331).

12525273221 is an equidigital number, since it uses as much as digits as its factorization.

12525273221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76842330.

The product of its digits is 16800, while the sum is 32.

The spelling of 12525273221 in words is "twelve billion, five hundred twenty-five million, two hundred seventy-three thousand, two hundred twenty-one".