20102102121001 has 4 divisors (see below), whose sum is σ = 21284578716372. Its totient is φ = 18919625525632.

The previous prime is 20102102120939. The next prime is 20102102121037. The reversal of 20102102121001 is 10012120120102.

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 18162555680025 + 1939546440976 = 4261755^2 + 1392676^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102102121001 - 2⁹ = 20102102120489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20102102121901) 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, 591238297660 + ... + 591238297693.

It is an arithmetic number, because the mean of its divisors is an integer number (5321144679093).

Almost surely, 2^{20102102121001} is an apocalyptic number.

It is an amenable number.

20102102121001 is a deficient number, since it is larger than the sum of its proper divisors (1182476595371).

20102102121001 is a wasteful number, since it uses less digits than its factorization.

20102102121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182476595370.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20102102121001 its reverse (10012120120102), we get a palindrome (30114222241103).

The spelling of 20102102121001 in words is "twenty trillion, one hundred two billion, one hundred two million, one hundred twenty-one thousand, one".