12221655601 has 4 divisors (see below), whose sum is σ = 12519744804. Its totient is φ = 11923566400.

The previous prime is 12221655539. The next prime is 12221655619. The reversal of 12221655601 is 10655612221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6360222001 + 5861433600 = 79751^2 + 76560^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221655601 - 2¹⁷ = 12221524529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221655101) 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, 149044540 + ... + 149044621.

It is an arithmetic number, because the mean of its divisors is an integer number (3129936201).

Almost surely, 2^12221655601 is an apocalyptic number.

It is an amenable number.

12221655601 is a deficient number, since it is larger than the sum of its proper divisors (298089203).

12221655601 is an equidigital number, since it uses as much as digits as its factorization.

12221655601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298089202.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 12221655601 in words is "twelve billion, two hundred twenty-one million, six hundred fifty-five thousand, six hundred one".