202120002101 has 4 divisors (see below), whose sum is σ = 202261445100. Its totient is φ = 201978559104.

The previous prime is 202120002061. The next prime is 202120002127. The reversal of 202120002101 is 101200021202.

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 104009475025 + 98110527076 = 322505^2 + 313226^2 .

It is a cyclic number.

It is not a de Polignac number, because 202120002101 - 2²² = 202115807797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120002151) 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, 70719356 + ... + 70722213.

It is an arithmetic number, because the mean of its divisors is an integer number (50565361275).

Almost surely, 2^202120002101 is an apocalyptic number.

It is an amenable number.

202120002101 is a deficient number, since it is larger than the sum of its proper divisors (141442999).

202120002101 is a wasteful number, since it uses less digits than its factorization.

202120002101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141442998.

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

Adding to 202120002101 its reverse (101200021202), we get a palindrome (303320023303).

The spelling of 202120002101 in words is "two hundred two billion, one hundred twenty million, two thousand, one hundred one".