202102010101 has 4 divisors (see below), whose sum is σ = 204103020204. Its totient is φ = 200101000000.

The previous prime is 202102010087. The next prime is 202102010113. The reversal of 202102010101 is 101010201202.

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 168145103025 + 33956907076 = 410055^2 + 184274^2 .

It is a cyclic number.

It is not a de Polignac number, because 202102010101 - 2⁹ = 202102009589 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 (202102010191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1000504900 + ... + 1000505101.

It is an arithmetic number, because the mean of its divisors is an integer number (51025755051).

Almost surely, 2^202102010101 is an apocalyptic number.

It is an amenable number.

202102010101 is a deficient number, since it is larger than the sum of its proper divisors (2001010103).

202102010101 is a wasteful number, since it uses less digits than its factorization.

202102010101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001010102.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 202102010101 its reverse (101010201202), we get a palindrome (303112211303).

The spelling of 202102010101 in words is "two hundred two billion, one hundred two million, ten thousand, one hundred one".