12221405125 has 16 divisors (see below), whose sum is σ = 15744328704. Its totient is φ = 9461730000.

The previous prime is 12221405117. The next prime is 12221405167. The reversal of 12221405125 is 52150412221.

It is not a de Polignac number, because 12221405125 - 2³ = 12221405117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 12221405125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1573081 + ... + 1580830.

It is an arithmetic number, because the mean of its divisors is an integer number (984020544).

Almost surely, 2^12221405125 is an apocalyptic number.

It is an amenable number.

12221405125 is a deficient number, since it is larger than the sum of its proper divisors (3522923579).

12221405125 is an equidigital number, since it uses as much as digits as its factorization.

12221405125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3153957 (or 3153947 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 12221405125 its reverse (52150412221), we get a palindrome (64371817346).

The spelling of 12221405125 in words is "twelve billion, two hundred twenty-one million, four hundred five thousand, one hundred twenty-five".