1222120001 has 4 divisors (see below), whose sum is σ = 1264262100. Its totient is φ = 1179977904.

The previous prime is 1222119979. The next prime is 1222120007. The reversal of 1222120001 is 1000212221.

It is a happy number.

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 614990401 + 607129600 = 24799^2 + 24640^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222120001 - 2¹⁰ = 1222118977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222120007) 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, 21071006 + ... + 21071063.

It is an arithmetic number, because the mean of its divisors is an integer number (316065525).

Almost surely, 2^1222120001 is an apocalyptic number.

It is an amenable number.

1222120001 is a deficient number, since it is larger than the sum of its proper divisors (42142099).

1222120001 is an equidigital number, since it uses as much as digits as its factorization.

1222120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42142098.

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

The square root of 1222120001 is about 34958.8329467675. The cubic root of 1222120001 is about 1069.1483020695.

Adding to 1222120001 its reverse (1000212221), we get a palindrome (2222332222).

The spelling of 1222120001 in words is "one billion, two hundred twenty-two million, one hundred twenty thousand, one".