12221461425561 has 16 divisors (see below), whose sum is σ = 16330707763200. Its totient is φ = 8129945747088.

The previous prime is 12221461425521. The next prime is 12221461425601. The reversal of 12221461425561 is 16552416412221.

It is an interprime number because it is at equal distance from previous prime (12221461425521) and next prime (12221461425601).

It is not a de Polignac number, because 12221461425561 - 2²³ = 12221453036953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12221461425521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 543810 + ... + 4973796.

It is an arithmetic number, because the mean of its divisors is an integer number (1020669235200).

Almost surely, 2^{12221461425561} is an apocalyptic number.

It is an amenable number.

12221461425561 is a deficient number, since it is larger than the sum of its proper divisors (4109246337639).

12221461425561 is a wasteful number, since it uses less digits than its factorization.

12221461425561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4431988.

The product of its digits is 230400, while the sum is 42.

Adding to 12221461425561 its reverse (16552416412221), we get a palindrome (28773877837782).

The spelling of 12221461425561 in words is "twelve trillion, two hundred twenty-one billion, four hundred sixty-one million, four hundred twenty-five thousand, five hundred sixty-one".