201020202101 has 4 divisors (see below), whose sum is σ = 209760210912. Its totient is φ = 192280193292.

The previous prime is 201020202067. The next prime is 201020202109. The reversal of 201020202101 is 101202020102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-201020202101 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 (201020202109) 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, 4370004371 + ... + 4370004416.

It is an arithmetic number, because the mean of its divisors is an integer number (52440052728).

Almost surely, 2^201020202101 is an apocalyptic number.

It is an amenable number.

201020202101 is a deficient number, since it is larger than the sum of its proper divisors (8740008811).

201020202101 is an equidigital number, since it uses as much as digits as its factorization.

201020202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8740008810.

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

Adding to 201020202101 its reverse (101202020102), we get a palindrome (302222222203).

The spelling of 201020202101 in words is "two hundred one billion, twenty million, two hundred two thousand, one hundred one".