201220020101 has 4 divisors (see below), whose sum is σ = 201238557804. Its totient is φ = 201201482400.

The previous prime is 201220020041. The next prime is 201220020149. The reversal of 201220020101 is 101020022102.

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 66713724100 + 134506296001 = 258290^2 + 366751^2 .

It is a cyclic number.

It is not a de Polignac number, because 201220020101 - 2²⁶ = 201152911237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220020301) 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, 9252560 + ... + 9274281.

It is an arithmetic number, because the mean of its divisors is an integer number (50309639451).

Almost surely, 2^201220020101 is an apocalyptic number.

It is an amenable number.

201220020101 is a deficient number, since it is larger than the sum of its proper divisors (18537703).

201220020101 is a wasteful number, since it uses less digits than its factorization.

201220020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18537702.

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

Adding to 201220020101 its reverse (101020022102), we get a palindrome (302240042203).

The spelling of 201220020101 in words is "two hundred one billion, two hundred twenty million, twenty thousand, one hundred one".