12221000001 has 48 divisors (see below), whose sum is σ = 21469878144. Its totient is φ = 6539162112.

The previous prime is 12220999991. The next prime is 12221000003. The reversal of 12221000001 is 10000012221.

It is not a de Polignac number, because 12221000001 - 2²¹ = 12218902849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (12221000003) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 182026 + ... + 239948.

It is an arithmetic number, because the mean of its divisors is an integer number (447289128).

Almost surely, 2^12221000001 is an apocalyptic number.

It is an amenable number.

12221000001 is a deficient number, since it is larger than the sum of its proper divisors (9248878143).

12221000001 is a wasteful number, since it uses less digits than its factorization.

12221000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58150 (or 58147 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 12221000001 its reverse (10000012221), we get a palindrome (22221012222).

The spelling of 12221000001 in words is "twelve billion, two hundred twenty-one million, one", and thus it is an aban number.