201020102109 has 16 divisors (see below), whose sum is σ = 297815773440. Its totient is φ = 134009704800.

The previous prime is 201020102093. The next prime is 201020102123. The reversal of 201020102109 is 901201020102.

It is not a de Polignac number, because 201020102109 - 2⁴ = 201020102093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201020102091 and 201020102100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201020102909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1190284 + ... + 1348634.

It is an arithmetic number, because the mean of its divisors is an integer number (18613485840).

Almost surely, 2^201020102109 is an apocalyptic number.

It is an amenable number.

201020102109 is a deficient number, since it is larger than the sum of its proper divisors (96795671331).

201020102109 is a wasteful number, since it uses less digits than its factorization.

201020102109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205377 (or 205371 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 201020102109 in words is "two hundred one billion, twenty million, one hundred two thousand, one hundred nine".