20101001021205 has 96 divisors (see below), whose sum is σ = 35925121180800. Its totient is φ = 9588366627840.

The previous prime is 20101001021203. The next prime is 20101001021207. The reversal of 20101001021205 is 50212010010102.

It is an interprime number because it is at equal distance from previous prime (20101001021203) and next prime (20101001021207).

It is not a de Polignac number, because 20101001021205 - 2¹ = 20101001021203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101001021203) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9390471 + ... + 11330619.

It is an arithmetic number, because the mean of its divisors is an integer number (374220012300).

Almost surely, 2^{20101001021205} is an apocalyptic number.

It is an amenable number.

20101001021205 is a deficient number, since it is larger than the sum of its proper divisors (15824120159595).

20101001021205 is a wasteful number, since it uses less digits than its factorization.

20101001021205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940311 (or 1940298 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 20101001021205 its reverse (50212010010102), we get a palindrome (70313011031307).

The spelling of 20101001021205 in words is "twenty trillion, one hundred one billion, one million, twenty-one thousand, two hundred five".