12221002001 has 16 divisors (see below), whose sum is σ = 13639868928. Its totient is φ = 10873440000.

The previous prime is 12221001997. The next prime is 12221002021. The reversal of 12221002001 is 10020012221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12221002001 - 2² = 12221001997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12221002021) 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, 40745 + ... + 161561.

It is an arithmetic number, because the mean of its divisors is an integer number (852491808).

Almost surely, 2^12221002001 is an apocalyptic number.

It is an amenable number.

12221002001 is a deficient number, since it is larger than the sum of its proper divisors (1418866927).

12221002001 is a wasteful number, since it uses less digits than its factorization.

12221002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121112.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12221002001 its reverse (10020012221), we get a palindrome (22241014222).

The spelling of 12221002001 in words is "twelve billion, two hundred twenty-one million, two thousand, one".