12221020001 has 6 divisors (see below), whose sum is σ = 12898085202. Its totient is φ = 11577808080.

The previous prime is 12221019997. The next prime is 12221020013. The reversal of 12221020001 is 10002012221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11320960000 + 900060001 = 106400^2 + 30001^2 .

It is not a de Polignac number, because 12221020001 - 2² = 12221019997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221020901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16926260 + ... + 16926981.

It is an arithmetic number, because the mean of its divisors is an integer number (2149680867).

Almost surely, 2^12221020001 is an apocalyptic number.

It is an amenable number.

12221020001 is a deficient number, since it is larger than the sum of its proper divisors (677065201).

12221020001 is an equidigital number, since it uses as much as digits as its factorization.

12221020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33853279 (or 33853260 counting only the distinct ones).

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

Adding to 12221020001 its reverse (10002012221), we get a palindrome (22223032222).

The spelling of 12221020001 in words is "twelve billion, two hundred twenty-one million, twenty thousand, one".