201220101 has 12 divisors (see below), whose sum is σ = 300027520. Its totient is φ = 129819240.

The previous prime is 201220073. The next prime is 201220199. The reversal of 201220101 is 101022102.

201220101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201220101 - 2⁵ = 201220069 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 360331 + ... + 360888.

Almost surely, 2^201220101 is an apocalyptic number.

It is an amenable number.

201220101 is a deficient number, since it is larger than the sum of its proper divisors (98807419).

201220101 is a wasteful number, since it uses less digits than its factorization.

201220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721256 (or 721253 counting only the distinct ones).

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

The square root of 201220101 is about 14185.2071186853. The cubic root of 201220101 is about 585.9903365559.

Adding to 201220101 its reverse (101022102), we get a palindrome (302242203).

The spelling of 201220101 in words is "two hundred one million, two hundred twenty thousand, one hundred one".