1220122001 has 8 divisors (see below), whose sum is σ = 1422883200. Its totient is φ = 1045818564.

The previous prime is 1220121967. The next prime is 1220122003. The reversal of 1220122001 is 1002210221.

It is a happy number.

It is not a de Polignac number, because 1220122001 - 2¹⁰ = 1220120977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220122003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1778261 + ... + 1778946.

It is an arithmetic number, because the mean of its divisors is an integer number (177860400).

Almost surely, 2^1220122001 is an apocalyptic number.

It is an amenable number.

1220122001 is a deficient number, since it is larger than the sum of its proper divisors (202761199).

1220122001 is an frugal number, since it uses more digits than its factorization.

1220122001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3557228 (or 3557214 counting only the distinct ones).

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

The square root of 1220122001 is about 34930.2447887214. The cubic root of 1220122001 is about 1068.5653469113.

Adding to 1220122001 its reverse (1002210221), we get a palindrome (2222332222).

The spelling of 1220122001 in words is "one billion, two hundred twenty million, one hundred twenty-two thousand, one".