201220100001 has 24 divisors (see below), whose sum is σ = 307320715520. Its totient is φ = 126516460896.

The previous prime is 201220099991. The next prime is 201220100017. The reversal of 201220100001 is 100001022102.

It is not a de Polignac number, because 201220100001 - 2¹⁵ = 201220067233 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201220100201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2600266 + ... + 2676531.

Almost surely, 2^201220100001 is an apocalyptic number.

It is an amenable number.

201220100001 is a deficient number, since it is larger than the sum of its proper divisors (106100615519).

201220100001 is a wasteful number, since it uses less digits than its factorization.

201220100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277045 (or 5277042 counting only the distinct ones).

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

Adding to 201220100001 its reverse (100001022102), we get a palindrome (301221122103).

The spelling of 201220100001 in words is "two hundred one billion, two hundred twenty million, one hundred thousand, one".